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System Alerts

https://www.airnow.gov/alert/4801

Wildfire Smoke in Multiple States

2024-11-14

Wildfire smoke continues to impact air quality in multiple states. Please use the Fire and Smoke map to check on wildfire smoke impacts in your area.

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Announcements

https://www.airnow.gov/announcement/4806

Fire and Smoke Map Version 4 Now Available

2024-09-05

The U.S. Environmental Protection Agency and the U.S. Forest Service are pleased to bring you this updated AirNow Fire and Smoke Map, with even more information you can use to protect yourself from wildland fire smoke. This new version features an updated display that allows you to get a quick glance at information, tailored user interfaces for both desktop and mobile, and faster loading. Learn more about the Fire and Smoke Map.

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How Ozone is Formed | AirNow.gov

How Ozone is Formed

Ground level ozone, a harmful air pollutant, is formed when pollutants emitted by cars, power plants, industrial boilers, refineries, chemical plants, and other sources react chemically in the presence of sunlight.

How Ozone is Formed

(1 p., 1 MB executable file)

AirNow.gov - Home of the U.S. Air Quality Index

Home | Site Map | Contact Us | Accessibility

AirNow.gov - Home of the U.S. Air Quality Index

Home | Site Map | Contact Us | Accessibility