This three-minute video describes how indoor air quality impacts your lungs, as well as providing practical tips for improving the indoor air quality in your home.

How IAQ Affects your Lungs

The air we breathe is filled with lots of things including gases and particles – Most are too small to see with the naked eye.

Everything we breathe affects our health in different ways.

Health effects from poor indoor air quality might include short-term symptoms like headaches, eye, nose, and throat inflammation, coughing and painful breathing, bronchitis, and skin irritation.

Extreme side effects can target the central nervous system, cause respiratory diseases like asthma, emphysema, and cause cancer and cardiovascular disease. Poor indoor air can also impact the blood, spleen, liver, and reproductive system.

Young children, older adults, and people with existing lung disease are most at risk of negative health effects from poor indoor air quality.

Before we can understand how indoor air quality impacts our lungs, we first need to understand how our lungs work.

When you breathe in through your nose or mouth, air travels down your airways, or trachea, dividing into your right or left lung via the bronchi.

The bronchi then separate into small tubes called bronchioles. Like tree branches, bronchioles divide into thousands of even smaller passages.

At the end of each bronchiole is a cluster of little air sacs called alveoli.

Alveoli are wrapped in tiny blood vessels called capillaries.

The air you breathe in fills these air sacs with oxygen-rich air. Here is where oxygen is transported throughout the body.

Not all the air you breathe is clean. Indoor air contaminants can include small particles that are suspended in the air.

When those particles from the air travel deep into your body, it can have a negative impact on your health.

These particles can include things like dust, tobacco smoke, diesel emissions, pollen, pet dander, mold spores, and more.

Particulate matter – often written as PM - are so small they go into the lungs all the way to the alveoli. Once there, they can irritate and corrode the alveoli wall, damaging the lungs and causing lung disease.

These pollutants, at high levels, have also been linked to an increased risk of stroke and heart attack.

The good news is that we can improve our indoor air quality.

Simple things you can do to improve your indoor air quality include:

Reduce dust by vacuuming regularly and using a microfiber or damp cloth for dusting.

Reduce humidity to avoid mold and mildew buildup and change appliance filters regularly.

And make sure to test your home for dangerous gases like radon. Doing so can help keep the air in your home safe.


We all want children and teachers to be safe at school. But there are some dangers—such as air pollution—that are not always obvious. Air pollution in schools can affect how children learn and harm their growing lungs. It can also cause health problems for faculty and staff.  You can help protect your family and your community by learning more about keeping the air in schools clean and healthy.

Schools face some special challenges in providing healthy indoor air for children, staff and faculty. School buildings are crowded places. They typically have four times as many occupants per square foot as office buildings. The multiple uses of school space, including classrooms, cafeterias, gyms, art rooms and labs mean many potential sources of indoor air problems. School budgets are often tight, which can affect regular maintenance and cleaning practices, and may defer major repairs like leaking roofs for years.

Protecting Yourself From Air Pollution at School 

Are you concerned about the quality of the air in your school? If you or your child has health symptoms, such as sneezing, coughing or headaches that are worse during the school day and improve at home, you may have an indoor air pollution problem. Learn more about recognizing indoor air problems

For more information about how to work with schools to provide a healthy school environment, check out the American Lung Association’s Asthma-Friendly Schools Initiative and the U.S. Environmental Protection Agency (EPA) Indoor Air Quality Tools for Schools program.

Page last updated: July 28, 2022

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