4 Active Air Quality Alerts
Affecting regions across the Western United States â updated hourly
Current air quality alerts issued by the U.S. EPA and state agencies
Region
Northern California, Southern Oregon
States
CA, OR
Pollutant
PM2.5
AQI Range
301â400
ðĄïļ Health Guidance
Avoid all outdoor activity. Keep windows and doors closed. Use air purifiers with HEPA filters. Wear an N95 mask if you must go outside. Sensitive groups should consider evacuating to areas with cleaner air.
Region
Greater Los Angeles Basin
States
CA
Pollutant
Ozone / PM2.5
AQI Range
151â200
ðĄïļ Health Guidance
Everyone may experience health effects. Reduce prolonged or heavy outdoor exertion. People with heart or lung disease, older adults, and children should avoid outdoor exertion.
Region
Seattle Metro, Puget Sound Region
States
WA
Pollutant
PM2.5
AQI Range
101â150
ðĄïļ Health Guidance
Sensitive groups â including people with asthma, heart disease, older adults, and children â should limit prolonged outdoor exertion. Consider wearing an N95 mask outdoors.
Region
Denver Metro, Front Range Corridor
States
CO
Pollutant
PM2.5
AQI Range
51â100
ðĄïļ Health Guidance
Unusually sensitive individuals may want to consider reducing prolonged outdoor exertion. Watch for symptoms such as coughing or shortness of breath.
Wildfire smoke is a mixture of gases and fine particles from burning trees and other plant material. It can harm your eyes, irritate your respiratory system, and worsen chronic heart and lung diseases.
Wildfire smoke contains fine particles known as PM2.5 â particles 2.5 micrometers or smaller in diameter. These particles are so tiny they can bypass your nose and throat and penetrate deep into your lungs, and even enter your bloodstream. Short-term exposure can trigger asthma attacks, heart attacks, and respiratory infections even in otherwise healthy adults.
2.5Ξm
Particle size â 30Ã smaller than a human hair
PM2.5
The primary pollutant in wildfire smoke
AQI 150+
When smoke becomes dangerous for everyone
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Stay Indoors
Keep windows and doors closed. Use recirculated air in your car's AC. Run an air purifier with a HEPA filter.
ð·
Wear an N95 Mask
Cloth and surgical masks do not filter fine smoke particles. Only N95 or KN95 respirators provide meaningful protection.
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Avoid Burning Indoors
Don't use candles, fireplaces, or gas stoves â they add to indoor pollution when outdoor air is already smoky.
ð§
Stay Hydrated
Drink plenty of water. Smoke irritates airways and staying hydrated helps your body cope with exposure.