AIRNow - Air Quality Maps

A cross-agency U.S. Government Web site. List of AIRNow partner agencies

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Accessibility

United States Air Quality Maps

Ozone and Particulate Matter (PM2.5) data are published as soon as practical after the end of each hour and as such are not fully validated. Maps are also archived in the same way. Therefore, data are only approved for the expressed purpose of reporting and forecasting the Air Quality. Maps are generally available after 9 a.m. EST.

Pollutant:

Ozone | Particles (PM2.5)

Map Area:

Map Date:

Map Type:

Current Hour	24-Hour AQI Loop
Daily 24-Hour AQI, (midnight to midnight)

Switch to Monthly Thumbnail Overview

Return to Air Quality Maps Homepage

How are the AQI maps calculated? | Why is the map not available?

Particles (PM2.5): Current Hour	United States
	Wednesday, January 14, 2009 03:24 PM EST

http://www.epa.gov/airnow/current/pm25/pm25_super_current_hour.gif

1 - 50
Good

51 - 100
Moderate

101 - 150
Unhealthy for
Sensitive Groups

151 - 200
Unhealthy

201 - 250
Very Unhealthy

Data Not Available

Particles (PM2.5): 24-Hour AQI Loop	United States
	Wednesday, January 14, 2009