Wildfire smoke sparks indoor air quality alerts

Monitoring PM (particulate matter) levels indoors during events like wildfires helps people understand when their air might be unsafe, helping them know when to take action.

NOAA

Updated on June 18, 2025

Airthings insights

Real-time data from Airthings' network of indoor air quality monitors shows PM levels spiking indoors both close to, and far away from burn sites, proving wildfire smoke enters homes and creates unsafe air.

Based on Airthings products measuring PM2.5 Learn more

United States

Canada

Europe

What is PM?

PM (particulate matter) consists of a range of fine particles generated by smoke, dust, dirt, and liquids that become suspended in the air. Higher concentrations of PM increase the likelihood of inhalation.

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Why monitor PM?

When you inhale PM, it can travel deep into your lungs and even into your bloodstream. These particles can cause irritation in eyes, ears, nose and throat, trigger asthma and allergies and even worsen coronary and respiratory disease.

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Indoor air quality monitors

With an indoor air quality monitor, you can track pollutants, like PM, in the air you breathe, anytime, anywhere, telling you if you need to take action to improve your air.

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Tips to stay safe during wildfire season

Keep windows and doors closed
Use an indoor air quality monitor to check your air
Run an air purifier with a HEPA filter
Switch HVAC systems to "recirculate"

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