Most Americans spend about 90% of their time indoors — yet the EPA estimates indoor air is often 2 to 5 times more polluted than outdoor air. The good news: improving indoor air quality doesn't have to be expensive or complicated.
1. Use a HEPA Air Purifier
A True HEPA air purifier removes 99.97% of airborne particles including dust, pollen, pet dander, mold spores, and some bacteria. Run it continuously in bedrooms and living spaces for the best results.
2. Ventilate When Outdoor Air Is Clean
When your local AQI is Good (0–50), open windows and doors to flush indoor pollutants. Check LocalAirData before ventilating on high-pollution days.
3. Control Humidity
Keep indoor humidity between 30–50%. High humidity encourages mold and dust mites; low humidity allows viruses to spread more easily. Use a dehumidifier in damp areas like basements.
4. Choose Low-VOC Products
Paints, cleaning products, and furniture off-gas volatile organic compounds (VOCs). Choose low-VOC or zero-VOC options and ventilate heavily after painting or installing new furniture.
5. Don't Smoke Indoors
Secondhand smoke is one of the most significant indoor air pollutants. If someone in your household smokes, ensure they do so outside, far from doors and windows.
6. Test for Radon
Radon is a colorless, odorless radioactive gas that seeps from the ground and is the second leading cause of lung cancer in the US. Test your home with an inexpensive kit — especially if you live in a high-radon region.
7. Clean Regularly
Regular vacuuming (with a HEPA-filter vacuum), dusting with damp cloths, and washing bedding weekly reduce the buildup of dust mites, pet dander, and other allergens.
8. Add Houseplants
While plants have a modest effect on air quality, they can absorb some VOCs and improve psychological wellbeing. Spider plants, snake plants, and pothos are easy to maintain.
9. Service Your HVAC System
Replace HVAC filters every 1–3 months with high-MERV-rated filters. Have ducts professionally cleaned every few years to remove accumulated dust and mold.
10. Don't Idle Vehicles in Attached Garages
Car exhaust from even a brief idle can seep into your living space through the attached garage. Always open the garage door before starting your engine and leave promptly.