Indoor Air Quality & Health: Why It Matters

Indoor air quality matters because the air inside your home directly affects your health, and most people breathe it far more than outdoor air. The U.S. Environmental Protection Agency (EPA) reports that Americans spend about 90% of their time indoors, where levels of some pollutants are often 2 to 5 times higher than typical outdoor levels. For older adults and anyone with asthma, heart disease, or a lung condition, poor indoor air can make existing health problems worse.

This guide explains why indoor air quality (IAQ) is so important, the health problems poor air can cause, and the common pollutants to watch for and how to monitor them.

Why indoor air quality affects your health

Because you spend so much time indoors, the quality of that air adds up over a lifetime. The EPA lists indoor air pollution among the top environmental risks to public health. Short-term exposure can cause irritation and discomfort, while long-term exposure is linked to serious respiratory, heart, and other chronic conditions.

Older adults are more vulnerable for two reasons: they tend to spend even more time at home, and age-related changes in the lungs and immune system make it harder to recover from irritants. Cleaner indoor air is one simple, low-cost way to support your overall health as you age.

Health problems linked to poor indoor air quality

Poor IAQ is associated with a range of short-term and long-term health effects. According to the EPA and the Centers for Disease Control and Prevention (CDC), these include:

• Irritation of the eyes, nose, and throat
• Headaches, dizziness, and fatigue
• Coughing and worsened asthma or allergy symptoms
• Complications for existing lung and heart conditions
• Carbon monoxide poisoning from faulty appliances
• Long-term risk of respiratory disease, heart disease, and cancer

Radon is a good example of the long-term risk. The EPA identifies radon, an invisible, odorless gas that can seep into homes from the ground, as the second leading cause of lung cancer in the United States after smoking. Any exposure to indoor pollutants can aggravate a pre-existing condition, so reducing it is worthwhile even when you feel fine.

Common indoor pollutants and how to monitor them

Common indoor pollutants come from building materials, appliances, furnishings, and everyday activities. The most frequent include:

• Radon
• Carbon monoxide and other combustion byproducts
• Secondhand smoke
• Mold and mildew
• Volatile organic compounds (VOCs) from paints, cleaners, and new furnishings
• Nitrogen dioxide and fine particulate matter
• Lead and asbestos in older buildings

You can monitor most of these at home. Install a carbon monoxide alarm, use an inexpensive radon test kit (radon is only detectable with a test), and consider a consumer air-quality monitor that tracks fine particulate matter (PM2.5) and VOCs. Simple habits help too: ventilate when cooking or cleaning, fix leaks quickly, and keep indoor humidity around 30% to 50% to discourage mold. Musty odors, condensation, and visible mold are warning signs worth investigating.

Frequently asked questions

Why is indoor air quality important for health?

Indoor air quality is important because Americans spend about 90% of their time indoors, where the EPA says some pollutants can be 2 to 5 times higher than outdoors. Breathing polluted indoor air over time is linked to respiratory illness, heart disease, and worsened asthma, and older adults are especially vulnerable.

What health problems are caused by poor indoor air quality?

Short-term effects include eye, nose, and throat irritation, headaches, fatigue, and worsened asthma or allergies. Long-term exposure is associated with respiratory disease, heart disease, and cancer, and radon exposure is the second leading cause of lung cancer in the United States according to the EPA.

What are common indoor air pollutants and how can they be monitored?

Common indoor pollutants include radon, carbon monoxide, secondhand smoke, mold, VOCs, and fine particulate matter. You can monitor them with a carbon monoxide alarm, a radon test kit, and a consumer air-quality monitor, and reduce them by ventilating, controlling humidity, and fixing moisture problems.

Talk to a licensed Medicare advocate

Staying healthy at home is one piece of a bigger picture. If you want help making sure your Medicare coverage supports your health and wellness needs, talk to a licensed Medicare advocate. It is a free, no-pressure conversation focused on what fits you.