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Environment · EPA AirData

Compare two counties

Pick a county for each column. Bars share one scale across the gutter, so a longer bar is literally more bad-air days. Each county is also flagged against the national county - the typical monitored county's 2 bad-air days, median AQI 38.

← Back to the atlas Illustrative
Riverside California
Bad-air days147
worse than national
Good days (AQI 0-50)15
worse than national
Median AQI87
worse than national
Peak AQI213
Top pollutant Ozone
San Bernardino California
Bad-air days144
worse than national
Good days (AQI 0-50)18
worse than national
Median AQI87
worse than national
Peak AQI593
Top pollutant Ozone
Los Angeles California
Bad-air days133
worse than national
Good days (AQI 0-50)70
worse than national
Median AQI80
worse than national
Peak AQI230
Top pollutant Ozone
Maricopa Arizona
Bad-air days73
worse than national
Good days (AQI 0-50)33
worse than national
Median AQI77
worse than national
Peak AQI261
Top pollutant Ozone
Salt Lake Utah
Bad-air days43
worse than national
Good days (AQI 0-50)110
worse than national
Median AQI54
worse than national
Peak AQI230
Top pollutant Ozone
Harris Texas
Bad-air days47
worse than national
Good days (AQI 0-50)154
worse than national
Median AQI61
worse than national
Peak AQI201
Top pollutant PM2.5
El Paso Texas
Bad-air days63
worse than national
Good days (AQI 0-50)102
worse than national
Median AQI67
worse than national
Peak AQI431
Top pollutant Ozone
Cook Illinois
Bad-air days21
worse than national
Good days (AQI 0-50)168
worse than national
Median AQI47
worse than national
Peak AQI158
Top pollutant Ozone
Fulton Georgia
Bad-air days12
worse than national
Good days (AQI 0-50)176
worse than national
Median AQI44
worse than national
Peak AQI132
Top pollutant Ozone
King Washington
Bad-air days8
worse than national
Good days (AQI 0-50)214
worse than national
Median AQI35
better than national
Peak AQI158
Top pollutant PM2.5
Denver Colorado
Bad-air days24
worse than national
Good days (AQI 0-50)121
worse than national
Median AQI48
worse than national
Peak AQI165
Top pollutant Ozone
San Francisco California
Bad-air days6
worse than national
Good days (AQI 0-50)236
worse than national
Median AQI34
better than national
Peak AQI152
Top pollutant PM2.5
Suffolk Massachusetts
Bad-air days4
worse than national
Good days (AQI 0-50)231
worse than national
Median AQI39
worse than national
Peak AQI118
Top pollutant Ozone
Baldwin Alabama
Bad-air days0
better than national
Good days (AQI 0-50)278
better than national
Median AQI40
worse than national
Peak AQI90
Top pollutant PM2.5
Clay Alabama
Bad-air days0
better than national
Good days (AQI 0-50)307
better than national
Median AQI29
better than national
Peak AQI75
Top pollutant PM2.5
District of Columbia District of Columbia
Bad-air days10
worse than national
Good days (AQI 0-50)158
worse than national
Median AQI45
worse than national
Peak AQI141
Top pollutant Ozone
Riverside California
Bad-air days147
worse than national
Good days (AQI 0-50)15
worse than national
Median AQI87
worse than national
Peak AQI213
Top pollutant Ozone
San Bernardino California
Bad-air days144
worse than national
Good days (AQI 0-50)18
worse than national
Median AQI87
worse than national
Peak AQI593
Top pollutant Ozone
Los Angeles California
Bad-air days133
worse than national
Good days (AQI 0-50)70
worse than national
Median AQI80
worse than national
Peak AQI230
Top pollutant Ozone
Maricopa Arizona
Bad-air days73
worse than national
Good days (AQI 0-50)33
worse than national
Median AQI77
worse than national
Peak AQI261
Top pollutant Ozone
Salt Lake Utah
Bad-air days43
worse than national
Good days (AQI 0-50)110
worse than national
Median AQI54
worse than national
Peak AQI230
Top pollutant Ozone
Harris Texas
Bad-air days47
worse than national
Good days (AQI 0-50)154
worse than national
Median AQI61
worse than national
Peak AQI201
Top pollutant PM2.5
El Paso Texas
Bad-air days63
worse than national
Good days (AQI 0-50)102
worse than national
Median AQI67
worse than national
Peak AQI431
Top pollutant Ozone
Cook Illinois
Bad-air days21
worse than national
Good days (AQI 0-50)168
worse than national
Median AQI47
worse than national
Peak AQI158
Top pollutant Ozone
Fulton Georgia
Bad-air days12
worse than national
Good days (AQI 0-50)176
worse than national
Median AQI44
worse than national
Peak AQI132
Top pollutant Ozone
King Washington
Bad-air days8
worse than national
Good days (AQI 0-50)214
worse than national
Median AQI35
better than national
Peak AQI158
Top pollutant PM2.5
Denver Colorado
Bad-air days24
worse than national
Good days (AQI 0-50)121
worse than national
Median AQI48
worse than national
Peak AQI165
Top pollutant Ozone
San Francisco California
Bad-air days6
worse than national
Good days (AQI 0-50)236
worse than national
Median AQI34
better than national
Peak AQI152
Top pollutant PM2.5
Suffolk Massachusetts
Bad-air days4
worse than national
Good days (AQI 0-50)231
worse than national
Median AQI39
worse than national
Peak AQI118
Top pollutant Ozone
Baldwin Alabama
Bad-air days0
better than national
Good days (AQI 0-50)278
better than national
Median AQI40
worse than national
Peak AQI90
Top pollutant PM2.5
Clay Alabama
Bad-air days0
better than national
Good days (AQI 0-50)307
better than national
Median AQI29
better than national
Peak AQI75
Top pollutant PM2.5
District of Columbia District of Columbia
Bad-air days10
worse than national
Good days (AQI 0-50)158
worse than national
Median AQI45
worse than national
Peak AQI141
Top pollutant Ozone

Bars use one shared scale across both columns. Each county is flagged against the national county independently - no fabricated pairwise verdicts. All figures illustrative; swap-point in HANDOFF.md.