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Did you know people spend as much as 90% of their time inside their homes, offices, schools, and cars?1 For people with allergies and asthma, air quality is important both indoors and out.

What Impacts Your Indoor Air Quality?

Air quality is a measure of gases and small particles in the air that can be harmful to your lungs. Air pollution is when particles or gases that are not normally part of the air affect the air quality. Air pollution can happen indoors when items in your home release gases and irritants into the air. Outdoor air pollution (traffic exhaust, wildfire smoke, smog, etc.) can make its way inside to worsen your indoor air quality.

Allergens (like dust mites and pet dander) also impact your air quality. Allergens are the most common asthma trigger. This is called allergic asthma. Some sources of indoor allergens include:

  • Dust mites
  • Pets
  • Cockroaches and mice
  • Mold and damp areas
  • Wall-to-wall carpet
  • Soft furniture and stuffed toys
  • Mattresses
  • Pillows and bedding

Some sources of indoor air pollution include:

  • Scented household cleaners and air-fresheners
  • Fuel-burning heat sources (such as gas stoves, cooktops, and fireplaces)
  • Smoke from cooking, candles, fireplaces or cigarettes, cigars, pipes, and e-cigarettes (vapes)
  • Vehicles or lawnmowers stored inside garages
  • Fumes from new furniture and carpet
  • Building and paint products
  • Pesticides
  • Radon
  • Cosmetics, perfumes, and hair sprays

October is National Indoor Air Quality Month. Having good indoor air quality is an important part of asthma and allergy management. Want to make your home healthier? Use our interactive Healthier Home Checklist to see how you can make different areas of your home healthier.

What Can You Do to Improve Indoor Air Quality?

The best way to improve indoor air quality is to get rid of the sources of allergies and irritants. Here are a few tips:

hand cleaning icon on a teal backgroundEstablish regular cleaning routines using CERTIFIED asthma & allergy friendlyยฎ cleaning products.

candle icon on a teal backgroundRemove scented candles and throw pillows.

dehumidifier icon on a teal backgroundKeep the humidity in your home under 50% to reduce growth of dust mites and mold and above 30% to prevent your skin, eyes, nose, and lips from drying out.

flooring icon on a teal backgroundReplace carpets with CERTIFIED solid surface flooring, if possible. Otherwise, vacuum weekly and have professional cleaning done a few times per year.

air cleaner icon on a teal backgroundUse a CERTIFIED air cleaner and filters.

The asthma & allergy friendlyยฎ Certification Program helps you make informed decisions for a healthier home. CERTIFIED products pass strict scientific tests to prove they are better suited for those with asthma and allergies. When you are shopping for products for your home, look for the CERTIFIED asthma & allergy friendlyยฎ mark. It indicates the product has passed our testing standards.

We have CERTIFIED many products. Visit to search for CERTIFIED products. There you can also learn more about the asthma & allergy friendlyยฎ Certification Program.

1. Indoor Air Quality. (2018, July 16).; U.S. Environmental Protection Agency.


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  • air cleaner icon on a teal background: air cleaner icon on a teal background
  • candle icon on a teal background: candle icon on a teal background
  • dehumidifier icon on a teal background: dehumidifier icon on a teal background
  • flooring icon on a teal background: flooring icon on a teal background
  • hand cleaning icon on a teal background: hand cleaning icon on a teal background

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