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How do emergency shelters get fresh air?

If you must go into an emergency shelter, then you can bet that conditions outside are not good, whether it’s a natural disaster, war or safety from criminal activity. You can store many supplies such as food and water for staying in a shelter, but without clean air, survival will only be minutes instead of days, weeks or months!  There are a number of things that air and ventilation systems need to accomplish for shelters:

1. Providing a positive pressure at all times so that contaminated air from leaks or outside sources does not enter the shelter.

2. Filtering out contaminants such as nuclear, biological, chemical (NBC) or smoke toxins. 

3. When the shelter must be completely closed up due to bad air quality outside, two things must happen: 

1. Removing carbon dioxide (CO2) byproducts of the people residing in the shelter.

2. Providing supplemental oxygen to replace the oxygen depleted by residents

Let’s go through these in order.  When the shelter is not being used or only tested during good external conditions, then its ventilation system can operate like your home system: bring in outside air, send it through filter(s) to remove dust and normal microbes like mold and bacteria, and keep a slight “overpressure” of 0.3 inches of water so that leaks in the shelter’s walls and doors will only cause air to move out, never in.  The exhaust “vents” are really one-way valves that only let air go out, so that air coming in is controlled.  They also protect residents of the shelter from any explosive “blast” of pressure and debris.  For this reason, they are called overpressure blast valves.   

The flow of fresh air should be similar to what is required at home: according to US standards, that is 0.35 air changes per hour (ACH) or 5 cubic feet per minute per person, whichever is greater (5 cfm is the specified minimum required by the US military, whereas 15 cfm is the recommended supply for ventilation in residential and commercial buildings).  That said, 5 cfm is usually the design criteria to remove the moisture and carbon dioxide (CO2) that shelter residents exhale, and make them feel comfortable.  The air intake must be protected from water and animal intrusion and sufficiently distant from the exhaust (overpressure blast valve) so that used air is not recycled through the shelter.  Routing airflow through the shelter ensures that the exhaust is in the airlock (the chamber where residents enter and exit) so that any outdoor contamination is flushed out with the positive air pressure.

NBC filtration (or as the military defines it CBRN: Chemical, Biological, Radiological, and Nuclear) requires unique filter material.  Pre-filters are used to keep dust and particulates out of the airstream, and then activated carbon impregnated with specific minerals is used to adsorb gasses that may be emitted during disasters or wars.  For example, the activated carbon may be mixed or “doped” with potassium permanganate, potassium iodide, or magnesium dioxide or copper dioxide (see our article on what these materials remove from air). These are not typical systems used in home ventilation, as the activated carbon must be in sufficient purity and quantity to allow filtration for a number of days until outside air clears.

In the event that outside air is heavily contaminated, the ventilation system will need to be completely sealed off and the shelter will operate more like a submarine, where supplemental oxygen is added and CO2 is removed.  The atmosphere needs to be maintained close to ambient outdoor air, at 19.5% oxygen and less than 0.2% (2000 ppb) CO2, and that’s a complex task when humans are using oxygen and expelling CO2 every minute!  It’s good in this case to use the same two principals we introduced in our article on submarines: use good instruments to measure the air quality and have redundant systems to ensure that each function is maintained in case of system failure.  In well-planned shelters, it’s common to have the following instruments: thermometer, humidity meter, differential pressure gauge (to maintain 0.3” water overpressure), smoke alarm, low oxygen detector, carbon monoxide alarm, carbon dioxide alarm, and a radon meter. (NBC Air Filtration Systems)

Although NBC filtration systems can be expensive, systems for adding oxygen and removing CO2 are even more expensive and complex.  Here are some ways that military and professional systems do it (Air Supply Principles in Isolated Shelters & Chambers):

Supplemental Oxygen is available in three different methods:  

1. Oxygen can be stored in a gas form under pressure or as liquid oxygen in cylinders, and released from these tanks when needed.

2. Oxygen generators can separate oxygen from compressed air stored in the tanks, or even generate oxygen from electrolysis of water (passing an electric current through it).

3. Oxygen “candles”, also called chlorate candles, are a very hot-burning cylindrical candle that actually puts out oxygen instead of consuming it.  

Removal of CO2 requires even more chemistry. On average, each person produces 1 kg of CO2 per day, and buildup of CO2 in the air is lethal (see our article on CO2 levels).  Therefore one or more of the following systems is needed:

1. CO2 scrubbers use a soda lime or lithium hydroxide material to remove CO2 from the airstream, but they produce a lot of moisture and heat and require space for storage of filters and material, which could be prohibitive for smaller bunkers.

2. Regenerative carbon-dioxide removal systems use a solid amine material and are advantageous in terms of space required, but have a high energy consumption and are costly to install.  

Since air supply is one of, if not the most, critical aspects of a shelter, these systems are best designed and installed by professionals who have experience.  In the survival shelter industry, NBC filter systems made by Israeli and European (Finnish and Swiss) companies differ significantly from those made in the US and UK.  The former systems are more robust, with significantly better materials, engineering and more generous carbon supply than others.  (NBC Air Filtration Systems)

Due to threats of war, disease and scarcity, many people are becoming interested in emergency shelters, but an improperly designed or constructed shelter can be more life-threatening than life-saving!  If you are interested in building or buying an emergency shelter, we recommend you check out this article and research first.  Having a place to retreat in emergency requires a lot of forethought and planning to truly make it "safe"!

Navigating Electromagnetic Frequency (EMF) Radiation

Convenience and technology go hand in hand.  If you want to save money at your store, the store’s “app” gives you the deals straight to your cellphone.  Smart doorbells and smart thermostats keep us safe and comfortable.  Baby monitors and cameras help us to keep an eye on the kids.  What could be better than knowing and doing more than your parents ever could?

The only problem with these perks is the energy they emit while helping you.  It’s called electromagnetic frequency radiation, or EMF for short.  Now, don’t get me wrong.  Anything that uses electricity, even a washing machine motor from the 1960’s, will have an electricmagnetic field associated with it, because that’s what electricity does.  Electrons move inside the electric supply cord, back and forth at the rate of about 60 cycles per second (60 hertz) in the US.  When the motor is energized, the electrons moving through the coils of the motor generate an electric field that spins the drum, and another motor that pumps out the water.  Electricity is right up there with indoor plumbing as something we wouldn’t want to be without!  

There is a big difference, however, between the way an old washing machine and a new cellphone use electricity and emit radiation.  The old washing machine had two modes, on and off, and it used power straight from the wall (110-120 volts alternating current, 60 hertz) with no transformers, inverters or rectifiers involved.   The cellphone, however, could never be plugged into the wall because it uses low voltage (12 volts) and “direct current” (DC).  The charger is plugged into the wall to convert high AC to low DC voltage to feed it to the sensitive electronics of the phone.  The phone, once charged, is essentially a battery with several different modes and the ability to radiate signals in a radius around it (about 30 feet for Bluetooth).  This generates two different problems with it: the way the charger manipulates electricity (taking the AC and converting it to DC and lowering the voltage) and the way both the charger and cellphone emit radiation.

“Dirty electricity” is admittedly not easy to understand.  After all, electricity is promoted to be the world’s cleanest energy, right?  We are enticed to replace everything that emits carbon with newer appliances that are “greener” for the planet with “no” emissions.   Yet, there is no such thing as free.  There are trade-offs for every convenience and savings in the pocket don’t always mean a savings to our peace of mind or health.

Since dirty electricity can’t be seen, smelled or touched, the best way to describe it is in pictures.   The photo below is of an alternating current electrical signal.  (If you don’t understand the difference between alternating and direct current, here is a really good video). The bright green line is clean power, which in alternating current is a smooth rolling sine wave (the peaks and valleys occur 60 times per minute, hence 60 hertz).  The green fuzz is dirty electricity, which is made up of jagged spikes that cause more radiation and can cause damage to equipment.  Where does the green fuzz come from?

Source: What is Dirty Electricity?

The green fuzz, or dirty power, is what is left over when you convert AC into DC or maneuver it in other ways.  Here is a video that visualizes what the little transformer/rectifiers on your cellphone charger and laptop chargers are doing to convert the power from the wall (120 volts AC) into usable power for your device (12 volts DC).  Chopping up the signal and smoothing it out causes some power “noise” and energy wastage.  Have you ever felt the transformer plug of the phone, or of your laptop computer?  Heat is another sign that there is energy being wasted.  

The green fuzz is not just ruining a nice picture of a sine wave.  The spikes and unpredictable energy can cause damage to electronics as well as to our bodies.  Dirty electricity can cause the following health issues (What is Dirty Electricity?) :

• Headaches

• Sleep Disturbances

• Fatigue

• Tinnitus

• Cognitive Impairment

• Heart Arrhythmia

• Mood Swings

• Weakening of the nervous, endocrine and immune systems

• Increased risk of serious chronic illnesses such as cancer

Why does dirty electricity affect us?  Because we, as humans, run on electricity too.  The nervous system that regulates many functions in our bodies is electrical, and its sensitive equipment and signals can be affected by outside electromagnetic radiation.  For example, scientists have known for a while that some types of EMF radiation can actually cause bone to grow, and calcium channel blockers (which are frequently prescribed for heart arrhythmias) block EMF effects because they block electrical activity in the body. (Electromagnetic fields act via activation of voltage-gated calcium channels to produce beneficial or adverse effects)

Many health effects are only manifested when a major change occurs, like the installation of a smart meter on our home, or a newly installed cellphone tower coming online nearby, or moving into an apartment with wi-fi signals surrounding yours.  However, symptoms can also be gradual as well.  Like the effects of mold and mycotoxins, EMF radiation seems to affect those who are most sensitive to them.  When most of the population are not affected outwardly, regulation of new and more profuse radiation is not a priority.  However, quantified effects on our microbiology such as blood, organs and DNA through research should be enough to increase awareness of its dangers.

Although governments and health organizations (including the WHO) have denied that there is any risk to our health from dirty electricity, here is a short list of studies that have shown there is a cause and effect.  Since animals are even more sensitive than humans (termed “canaries”), included are a couple of real-world case studies on how EMF has affected farm animals, with detrimental effects on their behavior, output and reproduction.

• Electromagnetic hypersensitivity: biological effects of dirty electricity with emphasis on diabetes and multiple sclerosis

• Power quality affects teacher wellbeing and student behavior in three Minnesota Schools

• Microwave frequency electromagnetic fields (EMFs) produce widespread neuropsychiatric effects including depression

• Low Intensity Electromagnetic Fields Act via Voltage-Gated Calcium Channel (VGCC) Activation to Cause Very Early Onset Alzheimer's Disease: 18 Distinct Types of Evidence.

• Wi-Fi is an important threat to human health

• Conspicuous behavioural abnormalities in a dairy cow herd near a TV and radio transmitting antenna

• Report to Michigan Oversight Committee regarding effects of stray voltage on dairy cattle 

The good news is that you can take control in your own home and eliminate some causes of dirty electricity.  Dimmer switches and compact fluorescent bulbs (CFLs) are some of the worst offenders, so try to eliminate these in your home.  Unplug computer and cellphone chargers whenever they are not in use, and when they are in use, keep them as far from you as possible.  

Other sources of EMF radiation can be controlled as well: 

• Smart meters: Smart meters are power meters that broadcast a signal similar to your cellphone, to the electric company so that they can monitor power usage remotely.  Although many utility companies claim that their meters only “broadcast” less than a minute per day, the pulses sent by the meter (typically 3 milliseconds each) can be over 10,000 times per day.  (Frequently Asked Questions about Smart Meters)  If you can, opt out of having a smart meter placed on your building and have it replaced with an analog meter.  If you cannot, there are meter cages available that can significantly block EMF radiation from the meter.  This video shows how high and frequently EMF radiation can be emitted from Smart Meters.

• Wireless routers: Unplug wireless routers at night and place them away from bedrooms or areas where people spend extended periods of time.  

• Baby Monitors: Research the baby monitor you use to see whether it is safe, and place it a safe distance from the crib or bed.  

• Cellphones: Restrict cellphone use by children and for adults, opt to use headsets or  speakerphone as often as possible, carrying the phone in a purse or away from your body.  

• Solar power inverters:  the process of converting low-voltage direct current into high voltage alternating current produces dirty electricity, which can build up over time to dangerous levels inside your home.

There are two types of devices that can detect EMF radiation: a Graham-Stetzer meter that measures dirty electricity in GS units (I’ll discuss this next), OR simply an AM radio!  AM radios can pick up low-order harmonics.  Tune it down to the lowest amplitude, about 500 kHz, to start, and turn up the volume a bit to hear the static.  Bring it near a possible EMF emitter like a cellphone or its charger plug, and listen for an increase in static or “ticks” to indicate it is emitting EMF radiation.  You can also tune the amplitude up to its highest, to about 1600 kHz, to see what’s going on there.  (This setting is better for “hearing” the EMF from your cellphone, which typically broadcasts on even higher frequencies).  This video shows how to use an AM radio inside your home to detect relative volumes of EMF radiation from different appliances (the dimmer switch really puts out a lot)!  Another video shows you how to detect whether EMF radiation is coming from the line power (from the power company), or from the devices, like lighting and electronics, in your house.  

If you find you have a lot of EMF radiation with the AM radio, then you might want to invest in a more quantitative meter that shows the real levels of radiation.  With a meter designed to detect EMF radiation, you can walk around your home to measure these levels.  The original meter, called a Graham-Stetzer Microsurge meter (after its inventors) measures EMF radiation in units of “GS”.  According to Dave Stetzer, a GS unit is a measure of the energy on electrical wires generated by high frequency transients and harmonics, and is influenced by voltage, amplitude and frequency. (presentation by Dr. Magda Havas, PhD).  According to one electrician, under 200 GS is good and acceptable, but Dr. Havas has noted that those who are more sensitive and already have health issues like diabetics and multiple sclerosis patients, require readings under 40 GS.  In order to reduce EMF, a “Stetzerizer filter” can simply be plugged into any normal electrical outlet.  This video shows how to use a Graham-Stetzer meter and Stetzerizer filters to get rid of dirty electricity.  After removing as many offending appliances as possible like dimmer switches, CFL bulbs and unused electronic charges, the filters are very easy to use–just plug them in! 

If you have unexplained or chronic health issues, it’s worth exploring and measuring EMF radiation in your home.  This type of pollution can’t be seen, smelled or heard but the health effects on many people are debilitating, and intervention can provide significant relief.  We hope you will do your own research on EMF radiation!

Taking precautions: What to do if your home is spared from a fire, but still smells like smoke

We at HypoAir sincerely hope that you and your family have not been forced out of your home by any of the recent wildfires.  Even if your home is spared from fire, if it is in close proximity, danger from lingering smoke particles is a real concern that you should know about and take precautions against.  You may know that smoke is a combination of ultra-fine particles and gasses, both of which can be toxic.  The gasses may be swept away by “airing out” your home or using activated carbon filters, but the particles settle into dust that can be disturbed anytime you clean or even when the HVAC comes on.  

A study was born in the weeks after the Marshall Fire, which occurred in the Boulder area in December 2021.  It spread very quickly and destroyed more than 1,000 homes and buildings.  Those that were near the flames but not burned, like the home of air quality scientist Christine Wiedinmyer, smelled like “the day after a campfire” and had ash on the door and window sills.  (Study finds potentially harmful chemicals lingered in homes affected by Marshall Fire)  Without testing, she did not know whether it was safe for her (or the neighbors who asked) to return to their homes.  So, she became part of a team of expert scientists who tested four homes in the area (including hers) in order to determine what toxins may have been left behind.  

The scientists collected samples of particles of dust in the air and on surfaces in January and February 2022. Elevated concentrations of potentially harmful materials like polycyclic aromatic hydrocarbons (PAHs) were detected in the dust samples.  PAHs are considered carcinogens by the Environmental Protection Agency, and it’s chemicals like these that deserve extra precautions in the way residents return to and clean their homes.  

When the scientists set up their equipment in the homes, they took dust samples from windowsills and used monitors to track particulate matter in the air, minute-by-minute.  The floating particles of ash produced by the fire seemed to settle out of the air in these houses within a day or two, but the dust that Wiedinmyer had seen on her windowsills lingered. In February, the researchers took measurements as a six-person cleaning crew entered one of the homes to vacuum and mop.  The concentrations of particles in the air nearly doubled during that time. Overnight in the same house, the team saw airborne particles spike about once every 20 minutes—likely due to the home's HVAC system switching on and off.  (Study finds potentially harmful chemicals lingered in homes affected by Marshall Fire) 

For this reason, the scientists recommend wearing a mask when you’re cleaning up fire damage, because human activity like cleaning resuspends the dust in the air, making it easy to breathe in.  Also, be sure to change your HVAC filter more frequently during the first few months after cleanup, and only use true HEPA vacuum cleaners, so exhaust from the vacuum cleaner will not blow dust back into the air.  Wiedinmyer herself “aired out” the home for a week before re-entering to clean.  During this time and going forward, a standalone HEPA filter would be very useful to filter particles that are missed by the HVAC system (if you have one!).  Our Germ Defenders, Mobile Air Angels and Whole Home Ionizers help to ionize and agglomerate dust, making it easier for the filters to trap it.

Another part of the aftermath of wildfires is dealing with contamination to drinking water systems. According to NPR for northern Colorado, The fire damaged six public drinking water systems, and toxic chemicals leaked into pipes from damaged homes and into hydrants where low water pressure created vacuums that pulled the compounds into the distribution system.  Although the personnel in these districts were not all clear on how and where to test, they were eager to do so when experts who had managed similar disaster response teams educated them.  Andrew Whelton, a professor of civil, environmental and ecological engineering at Purdue University, has taken part in several water disaster recoveries, including the 2017 Tubbs Fire and the 2018 Camp Fire in California, the Joint Base Pearl Harbor-Hickam contamination, and a chemical spill in West Virginia.  In a study he co-authored, he said that although the Marshall Fire response was not perfect, major crisis was averted because authorities did not refuse to test.  (Sadly I think many of us can recall other disasters that did not go so well).

There were a couple reasons that contaminants were introduced into these drinking water systems.  First, when a system loses pressure, toxins like wildfire smoke can get sucked into the distribution system.  Second, overheated plastic pipe can leach benzene and other chemicals for months or even years.  According to Whelton’s research, plastic pipes were primed to leach chemicals by temperatures as low as 392 degrees Fahrenheit; wildfires can exceed 1,400 degrees.  Thirdly, flushing out the system quickly with clean water is important to prevent smoke and chemicals from reaching damaged pipe, which can act as a reservoir for such toxins.

If your home survives a fire in the future, remember that unseen dangers like carcinogens may still linger and you need to take caution with your air and your drinking water.  Although it seems that authorities in the Boulder area were for the most part very proactive for public health during the Marshall Fire response, it’s usually up to individual residents in wildfire-prone areas to have stores of masks, filters and clean drinking water.  We hope you don’t have to go through such a catastrophe, but it certainly doesn’t hurt to be prepared.

UPDATE:  Another professor, Delphine Farmer from Colorado State University, wrote a followup article explaining smoke and VOC behavior in a test house during the Chemical Assessment of Surfaces and Air, or CASA, study in 2022.   She found that VOCs that entered a home are adsorbed into surfaces and while they may temporarily clear by opening doors and windows (“airing out”), they quickly built up again after ventilation stops, and the house would slowly release those VOCs back out over the next hours, days or even months, depending on the type of VOC.  They found that air purifiers can remove only some of the VOCs that are in the air – they can’t clean the VOCs on your floors or in your walls. They also work only when they’re running, and even then, air purifiers don’t work particularly well to reduce VOCs.

The good news is that basic household cleaning–vacuuming, dusting and mopping with a commercial, nonbleach solution–removed most of the VOCs.  This means that while you’re cleaning for particles, VOCs are also removed.  Check out our article on Tackling Dust in Your Home for our recommendations on appliances and cleaning products to get ‘er done, but don’t forget to add the personal protective gear mentioned above, as well!

Keeping Your Vacation Home Fresh

It doesn’t matter whether your “vacation home” is a pull-behind trailer, or a luxurious condo, or a humble cabin in the mountains:  when you “get away” to a relaxing place, you don’t want to spend your precious vacation time trying to figure out how to get musty smells out or remove mold from the linens because the climate inside suffered while you were away.  Here are our tips to make it welcoming and low-maintenance!

First of all, humidity is the most important factor you’ll want to control in order to keep out mold, and you’ll want to keep the humidity under 60% all the time.  If the outside climate humidity rises over 60%, that climate will come inside and settle into soft surfaces, making them a perfect habitat for mold growth. You can only control humidity inside effectively by having a tight envelope, which means sealing up passages where outside air can penetrate in.  If no one will be living there while you’re away, you won’t need fresh-air ventilation, so make your get-away home as tight as possible by sealing windows, doors, attic doors, and other penetrations.  

Also, remember that relative humidity and temperature are closely linked.  For example, if you leave an air conditioner set on 82 degrees and the humidity rises to 80%, you may be at risk of mold forming in less than 2 weeks!  (If you’re wondering how that calculation came to be, check out this fun dew point calculator.)  In addition, relative humidity in a space will increase as temperature is lowered.   Air conditioning will naturally take some of the humidity out of the air, but there are a number of factors that can allow humidity to remain high even when your air conditioner is on. 

Here are some options to keep the humidity under control while you’re not there:

• If you have wi-fi available in your vacation home, now’s the time to take advantage of technology that can pair with existing units like mini-splits, window or portable air conditioners to enable you to monitor climate and control them remotely.  Cielo is a company that has a number of products that can help you maintain the right humidity and temperature remotely. 

• Alternatively, if you do not have wifi or app-enabled monitoring, you’ll need to choose a temperature for setting your air conditioner.  Although it’s tempting to set the temperature just under the temperature of melting plastic (haha) to conserve energy, don’t do it!  Setting the thermostat as high as 85 degrees can cause short run times and not allow the air conditioner to remove enough humidity from the air, creating an atmosphere for mold growth.  (No, You Shouldn’t Set Your Thermostat to 85F.  Here’s Why.)  For that reason, it’s ok to set it 7-10 degrees above the temperature you normally keep it while you’re staying there IF you also take into account the outdoor temperature and humidity.  There’s no magic formula for determining this ideal energy-saving-yet-mold-preventing temperature setting, but think about it: if your vacation space is in a hot, humid climate like the southeast US, you’ll want to set the maximum indoor temperature lower than the average outdoor temperature to make the air conditioning come on often enough to remove humidity.  

• Thirdly, if you don’t have a humidity control setting on your air conditioner, or even an air conditioner at all, it’s best to purchase a dehumidifier with a humidistat and set it to 60% maximum humidity.  This will ensure that humidity is being controlled, no matter what temperature the interior rises to!  Think of this dehumidifier as insurance against mold: if your air conditioner was to stop working, the dehumidifier can still keep your space mold-free if it’s suitably sized for your space.  Check out our article on different types and sizes of dehumidifiers, and be sure to set up a portable dehumidifier with a drain into a lower tub or sink that condensate can safely drain all the time.

• Leave doors to rooms and closets open for best air circulation.  Just like air purifiers, portable dehumidifiers cannot reach behind closed doors.  

• Use ceiling fans in rooms and portable fans elsewhere to keep air circulating while you’re away, which will reduce the water content in all your furnishings by evaporation.  ““Evaporation increases the humidity of the atmosphere that immediately surrounds the liquid. This humid air takes some time to dissipate into the rest of the atmosphere. The presence of a breeze, a powerful wind, or some other form of air circulation can speed up this process and make the environment of the liquid less humid. Therefore, by decreasing the humidity of the liquid’s surrounding, a powerful breeze or wind can increase the rate at which the liquid evaporates.” (Factors Affecting the Rate of Evaporation)  This is why disaster restoration companies use powerful fans to move air over wet surfaces, increasing evaporation and removal of water.  With less water in your furnishings, the chance of mold growth is reduced.   You can even add air circulation to any space that has a light socket, such as closets and pantries, by removing the light bulb and screwing in a light socket fan (which come in different designs with exposed or enclosed blades).

• Make sure your air conditioning and dehumidifier drains are clear and a clean air filter is in place before you leave!  Many homeowners have come on vacation to find their air conditioner or dehumidifier drain pan overflowing and dripping onto ceilings, floors, and other inconvenient places–what a mess that can also turn into hazardous mold!  As a homeowner, make sure to check these drains and change the filter several times during the air conditioning season, or arrange for someone to do the same while you’re away. 

• Window air conditioners need deep-cleaning sometimes.  If a musty smell is coming from the air conditioner when the fan cycles on, then you’ll know that dust has infiltrated the cooling coils, absorbed moisture, and is nourishing mold growth.  Check our article on how to deep clean it and restore the fresh smell.

• If you can, shut off water at the main valve to avoid any possible leaks, and switch off the breaker to the hot water heater if it’s electric (turn off gas if it’s gas).  This will avoid water leaks under sinks, which can make a nasty moldy mess!  If you don’t do this, at the very least shut off water to the washing machine, because burst water hoses at the washer are the single largest cause of home flooding.  (Leaving the House for 3 Days or 3 Months? 5 Must-Dos Before Your Trip)

• Bipolar ionization units like our Germ Defenders, Mobile Air Angels and Whole Home Ionizers are a great way to keep mold away too.  At the very least, plugging a Germ Defender into the bathroom will send out ions to kill mold spores in this small space where air circulation can be a challenge.

• Leaving a portable HEPA filter with activated carbon running is not a bad idea, either.  Activated carbon will help avoid that “musty” smell.  According to firesafeliving.com,  “plug-in” scent devices are not a fire hazard if you leave them plugged in while you’re away, but we at HypoAir don’t recommend them because a) many plug-ins use toxic chemicals like phthalates and formaldehyde, and b) the freshener will dry out before you return anyway, leaving an appliance running on your wall.  What’s better: make your own reed diffusers with your favorite essential oil (or combination of oils) and place them throughout your space for a safe, no-mess fresh scent!

These extra steps may seem to take more time on those days you’re packing up to leave your vacation home, but when you come back to a home that is ready for relaxing as soon as you open the doors and windows, it will be worth it!

Fire and Smoke Recovery

Wildfires have been very destructive in the western half of the US in the late 2010's and early 2020’s.  As for the future, a 2022 report by the UN Environment Programme (UNEP) and GRID-Arendal projects an increase in extreme fires by 14% by 2030, 30% by the end of 2050, and 50% by 2100, due to climate change and land-use change. (breezometer.com)  

Fire disasters, like natural disasters, do not just destroy what the fire touches.  They can disrupt major infrastructures like highways and railways, power and water, and most important, air quality.  Because fires may smolder for some time, try to prepare to deal with the effects for weeks. 

If you live in an area prone to wildfires or prevailing winds that may carry smoke, here are some ways to prepare:

• Seal doors and windows with weatherstripping, caulk and door sweeps.  
• Find out how to adjust your HVAC system accordingly: you’ll want to close the fresh air intake and change over to recirculation, no matter whether you have central AC, a window air conditioner or portable air conditioner.
• Purchase extra MERV 13 or higher filters for your HVAC system, to be used on poor air quality days.
• If you live in an apartment building or condo with little control over the HVAC, consider purchasing vent filter material so you can place them in the vents into your space. Carbon vent filter material will neutralize many VOCs as well.
• Purchase a HEPA air cleaner (non-ozone producing type) and be sure to have an extra filter or two on hand.    
• Keep a number of N95 respirator masks on hand.    
• Keep canned food and bottled water on hand.
• Stock up on essentials for cleaning smoke odor: baking soda, white vinegar, rags, TotalClean

During:

• Try not to cook during a wildfire emergency, because cooking indoors increases small particulates and vapors in the air, and you won’t want to turn on your stove exhaust, as that will draw polluted outdoor air into the house.  Try to use just the canned food you have on hand.
• Monitor the filters in your HVAC system and air purifiers and change them when you start to notice a color change on the front of the filter, or when the output air starts to smell like smoke. 
• Check your local air quality and receive updates from airnow.gov . Fire and smoke maps are available under the heading fire.airnow.gov.  You can also register for a free 14-day trial of Breezometer’s Air Quality app.  Below is a diagram to understand air quality index values (airnow.gov).
• Use N95 respirators to evacuate to a safer place if necessary.  

Source: airnow.gov

After:  

• Don’t open windows and doors until the air quality index is less than 100.  When that happens, you can open windows fully to get more fresh air ventilation. 
• Set up fans near doors and windows to “push” smoke odor and soot outside.

To remove smoke odor that infiltrated from outside, or if you had a fire in your home:

• Run air purifier(s) continuously with charcoal filters. 
• Sprinkle baking soda over carpets and rugs and leave it overnight.  Then using a vacuum with HEPA filter, vacuum out the carpets.  
• Remove drapes, towels, and any hanging fabric exposed to smoke, and either launder it in your washing machine or send it for professional cleaning.  When washing it yourself, you can add a cup of distilled white vinegar to your regular laundry detergent to remove smoke.  Don’t machine dry the item until the odor has been removed; it may need an additional washing cycle.
• Wipe down all hard surfaces, including walls, ceilings, floors and windows with TotalClean or a 1:1 mixture of warm water and white vinegar (TotalClean is more gentle than vinegar and can be used on stone, wood, etc.)  Dispose of rags or wash them out with mild detergent and water as you go.  

To clean fabric-upholstered items:

• Try to remove any cushion covers that are washable.  
• Clean bare foam cushions by using “air replacement”:  Place the cushion into a large vacuum-seal bag and sprinkle baking soda over it.  Seal the bag and use your HEPA vacuum to remove the air from inside the cushion.  Let the air back into the bag to re-inflate the cushion.   Repeat several times if necessary. 
• Sprinkle baking soda over the piece and let it set overnight before vacuuming it off.
• You can also move the piece outside to air it out in the sun.  
• It’s difficult to remove smoke that’s settled into furniture, however, if it does not dissipate following using an ozone generator, you can contact a restoration company for their services if it’s a valuable piece to you.

Try an Ozone Generator to remove smoke odors:

• Ozone generators should only be used once all surfaces that can be cleaned are thoroughly cleaned (walls, floors and ceilings too!).  
• Ozone is not as effective in areas of high humidity, so running the air conditioner or a dehumidifier in the space to get the humidity down (60% or less) is advisable.  Central air conditioning and any exhaust fans must be shut down when using the ozone generator, though, because you’ll want the ozone to stay in the space. 
• Use fan(s) within the space to circulate the ozone.
• Ozone generators cannot be used in the presence of people, pets or plants, but once these are removed, they can be quite effective in removing smoke.  Follow all instructions to seal up the space and allow it to work for the full time advised before ventilating.  Contact HypoAir regarding rental of our ozone generators, or local restoration companies may rent ozone generators.    

For large areas with open walls and ceilings such as basements, garages or gutted homes, consider having them soda blasted by professionals to remove soot and smoke odor from the structure in hard-to-reach places.  Baking soda’s legendary cleaning and odor-absorption qualities can produce amazing results when combined with commercial equipment and a skilled contractor.

Don’t: 

• Spray deodorizers or fresheners to “cover up” the smell of smoke, because they do nothing to remove the contaminants, and many have toxic ingredients in them.
• Attempt to live in spaces with heavy smoke damage until they are cleaned.  “Third-hand smoke” is the term used for the way carbon and chemicals in the smoke react to the materials in your home, and it can make you very ill.
• Neglect flood remediation if the smoke damage was part of a fire in your home and fire response crews extinguished it using water.  Building materials must be removed or dried thoroughly within 48 hours in order to prevent mold growth. 

Micro- and Nanoplastics are everywhere

Children especially are moved with compassion for animals.  I remember learning as a child that non-biodegradable plastic often ends up in the ocean, and sea animals like birds and fish can get entangled in plastics like 6-pack rings, so I started to cut apart the rings before throwing them away so that the animals wouldn’t strangle.  Later I learned that some plastic bags were being manufactured as “biodegradable”; this was some relief to my mind.  However, the newest question is, into what are they degrading?   It turns out that plastics are coming back to us in invisible ways when they break down into microplastics and nanoplastics.

Microplastics, artificial polymer particles with size less than or equal to 5 mm, were initially reported in 2004 (2022 study: Nanoplastics and Human Health: Hazard Identification and Biointerface).  They are produced from disintegration of plastic products, from the ubiquitous plastic shopping bags to a child’s toy stroller to an empty jug of laundry detergent. Small millimeter-sized pieces of plastic seem like they would produce a lot of plastic “sand” that could be filtered out of water or even pass through our digestion system unchanged.  Yet microplastics are not the end product; nanoplastics are.  Nanoplastics are particles with a size ranging between 1 nm and 1 μm, which cannot be seen by the human eye.  

Nanoplastics come from a lot of different sources and some surprising ones.  We’ve written about different harmful nanoparticles that can be emitted into the air and water: from ceramic coated cooking pans, 3D printers, dust particles, from combustion engines, graphene, household cleaning products, and microfibers that get released in your washing machine and dryer (some of which are actually nanoplastics).  Here’s a new one to us: huge amounts of nanoplastics are released by car and truck tires every year by the simple acts of driving and braking.  

According to National Geographic, “Tires are actually among the most common plastic polluters on earth. A 2017 study by Pieter Jan Kole at The Open University of The Netherlands, published in the International Journal of Environmental Research and Public Health, estimated that tires account for as much as 10 percent of overall microplastic waste in the world’s oceans. A 2017 report by the International Union for Conservation of Nature put that number at 28 percent.”

“Today tires consist of about 19 percent natural rubber and 24 percent synthetic rubber, which is a plastic polymer.”  Considering that each (car) tire will lose about 1.5-2 lbs of weight over its lifetime, which is the wear of rubber and plastics from it, millions of tires on our roads add up to tons of micro- and nanoplastics.  

Nanoplastics are dangerous to the environment and to us.  The following diagram shows the many ways our bodies are exposed to them: