While the world frets over climate change and greenhouse gases, irrefutable evidence shows that the air quality in homes poses significant and immediate health risks. According to a report from the Environmental Protection Agency (EPA), the air within homes and other buildings can be up to five times more polluted than outdoor air. The EPA also estimated that people spend approximately 90 percent of their time indoors, including the schoolroom, the workplace, and home. Fortunately, the air quality can be improved in our homes today.
Indoor air is not just a health risk but a looming crisis! This topic is near-and-dear to my lungs, as my beloved brother had allergy-induced asthma since he was a teen. In researching for this blog, I reached out to the Asthma and Allergy Foundation of America (AAFA), which is a not-for-profit organization that was founded 50 years ago. AAFA’s mission is dedicated to saving lives and reducing the burden of disease for people with asthma and allergies through support, advocacy, education, and research.
“Indoor air quality (IAQ) is so huge now,” says Michele Ann Cassalia, Director of Marketing at AAFA. “The fact that we use IAQ and everybody knows what it stands for — it’s huge.” This has become such an issue that October is National Indoor Air Quality Month. “You never would’ve heard of that 10 years ago,” says Cassalia.
Indoor Air Quality (IAQ) refers to the air quality within and around buildings and structures, especially as it relates to the health and comfort of building occupants. Understanding and controlling common pollutants indoors can help reduce your risk of indoor health concerns.
Health effects from indoor air pollutants may be experienced soon after exposure or, possibly, years later.
Some health effects may show up shortly after a single exposure or repeated exposures to a pollutant. These include irritation of the eyes, nose, and throat, headaches, dizziness, and fatigue. Such immediate effects are usually short-term and treatable. Sometimes the treatment is simply eliminating the person’s exposure to the source of the pollution, if it can be identified. Soon after exposure to some indoor air pollutants, symptoms of some diseases such as asthma may show up, be aggravated or worsened.
The likelihood of immediate reactions to indoor air pollutants depends on several factors including age and preexisting medical conditions. In some cases, whether a person reacts to a pollutant depends on individual sensitivity, which varies tremendously from person to person. Some people can become sensitized to biological or chemical pollutants after repeated or high level exposures.
Certain immediate effects are similar to those from colds or other viral diseases, so it is often difficult to determine if the symptoms are a result of exposure to indoor air pollution. For this reason, it is important to pay attention to the time and place symptoms occur. If the symptoms fade or go away when a person is away from the area, for example, an effort should be made to identify indoor air sources that may be possible causes. Some effects may be made worse by an inadequate supply of outdoor air coming indoors or from the heating, cooling or humidity conditions prevalent indoors.
Other health effects may show up either years after exposure has occurred or only after long or repeated periods of exposure. These effects, which include some respiratory diseases, heart disease and cancer, can be severely debilitating or fatal. It is prudent to try to improve the indoor air quality in your home even if symptoms are not noticeable.
While pollutants commonly found in indoor air can cause many harmful effects, there is considerable uncertainty about what concentrations or periods of exposure are necessary to produce specific health problems. People also react very differently to exposure to indoor air pollutants. Further research is needed to better understand which health effects occur after exposure to the average pollutant concentrations found in homes and which occurs from the higher concentrations that occur for short periods of time.
Indoor pollution sources that release gases or particles into the air are the primary cause of indoor air quality problems. Inadequate ventilation can increase indoor pollutant levels by not bringing in enough outdoor air to dilute emissions from indoor sources and by not carrying indoor air pollutants out of the area. High temperature and humidity levels can also increase concentrations of some pollutants.
There are many sources of indoor air pollution. These can include:
The relative importance of any single source depends on how much of a given pollutant it emits and how hazardous those emissions are. In some cases, factors such as how old the source is and whether it is properly maintained are significant. For example, an improperly adjusted gas stove can emit significantly more carbon monoxide than one that is properly adjusted.
Some sources, such as building materials, furnishings and products like air fresheners, can release pollutants more or less continuously. Other sources, related to activities like smoking, cleaning, redecorating or doing hobblies release pollutants intermittently. Unvented or malfunctioning appliances or improperly used products can release higher and sometimes dangerous levels of pollutants indoors.
Pollutant concentrations can remain in the air for long periods after some activities.
If too little outdoor air enters indoors, pollutants can accumulate to levels that can pose health and comfort problems. Unless buildings are built with special mechanical means of ventilation, those designed and constructed to minimize the amount of outdoor air that can “leak” in and out may have higher indoor pollutant levels.
Outdoor air can enter and leaves a building by: infiltration, natural ventilation, and mechanical ventilation. In a process known as infiltration, outdoor air flows into buildings through openings, joints, and cracks in walls, floors, and ceilings, and around windows and doors. In natural ventilation, air moves through opened windows and doors. Air movement associated with infiltration and natural ventilation is caused by air temperature differences between indoors and outdoors and by wind. Finally, there are a number of mechanical ventilation devices, from outdoor-vented fans that intermittently remove air from a single room, such as bathrooms and kitchen, to air handling systems that use fans and duct work to continuously remove indoor air and distribute filtered and conditioned outdoor air to strategic points throughout the house. The rate at which outdoor air replaces indoor air is described as the air exchange rate. When there is little infiltration, natural ventilation, or mechanical ventilation, the air exchange rate is low and pollutant levels can increase.
EPA defines environmental justice (EJ) as “the fair treatment and meaningful involvement of all people regardless of race, color, national origin, or income with respect to the development, implementation, and enforcement of environmental laws, regulations, and policies.”
To effectively address EJ concerns, the Agency recognizes that communities must be the impetus for implementing local solutions for environmental health problems including indoor air. However, far too many communities lack the capacity to truly effect their environmental conditions. This includes some conditions found indoors, as well as conditions caused by outdoor impacts (such as climate change).
Many reports and studies indicate that the following populations may be disproportionately impacted by indoor asthma triggers, secondhand smoke, mold, radon and other indoor pollutants:
EPA’s Indoor Environments Division (IED) provides guidance and programs to help build the capacity of communities to understand and avoid indoor and outdoor health impacts. IED’s main objective is to improve indoor air quality in buildings where people live, learn and work.
According to CEPA (Canadian Environmental Protection Act) has illustrated that cleaning HVAC and furnace systems enables them to run much more efficiently by eliminating debris and dirt from sensitive components within the mechanical systems.
§ Most people spend about 60 – 90% of their time indoor so both duct and furnace cleaning is crucial. In fact, more than 50 percent of all illnesses or other key health issues are either aggravated or caused by poor indoor air quality.
Children appear to be more affected by dirty air since they’re generally closer to the floor where concentrated air is the highest and they also tend to breathe faster.
Asthmatic sufferers, the elderly, and individuals with respiratory issues, including lung disorders and allergies, are naturally more sensitive to air pollutants.
Polluted air contributes to poor lung function, which affects more than 20,000 people in Canada alone each year.
Most furnace filters are effective in stopping airborne pollen, dust & dirt by only 7%.
One-sixth of all individuals who suffer from chronic allergies do so due to the direct relationship with both bacteria and fungi in their home’s air duct system.
More than 90% of all HVAC failures are due to dirt, dust & debris within the system itself.
Incredibly, just 1mm speck of dirt sitting on a HVAC coil has the ability to decrease its overall efficiency by more than 20%.