Indoor Air Quality: What's Polluting Your Home and How to Fix It

Most people are surprised to learn that indoor air is typically 2–5 times more polluted than outdoor air. We spend 90% of our time indoors, yet rarely think about what we're breathing.

The main indoor air pollutants:

VOCs (Volatile Organic Compounds) are emitted by paints, cleaning products, air fresheners, new furniture, and carpets. Many are harmful with long-term exposure.

Particulate matter includes dust, pet dander, pollen, and smoke particles. Fine particles (PM2.5) are small enough to penetrate deep into the lungs.

Carbon dioxide builds up in poorly ventilated rooms and causes fatigue, headaches, and reduced concentration — even at levels that aren't dangerous.

Radon is a naturally occurring radioactive gas that seeps up from the ground. It accumulates in basements and lower floors and is the second leading cause of lung cancer after smoking.

The most effective improvements:

Ventilation is the most important factor. Open windows when weather permits. If you have an HRV (heat recovery ventilator), use it. Fresh air dilutes all indoor pollutants.

HEPA air purifiers are highly effective for particulate matter. Run one in your bedroom while sleeping — you spend a third of your life there.

Switch to natural cleaning products. Vinegar, bicarbonate of soda, and certified natural cleaners are effective and don't release VOCs.

Test for radon if you have a basement or live in a high-risk area. Test kits cost $15–$30 and could save your life.

Houseplants improve air quality modestly and have proven psychological benefits. Spider plants, peace lilies, and snake plants are the most effective.