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Air quality in Texas

EPA monitors report from 45 of Texas’s 254 counties. That is the honest limit of this page: the other 209 are not measured, not clean. In 2025 the most affected monitored county was El Paso County, with 63 days above the moderate category.

45
Counties with monitors
209
Counties without
291
Days above moderate, 2025
Summed across monitored counties
9.5%
Adults with asthma
Population-weighted county estimate

County by county

Monitored Texas counties

GoodModerateUnhealthy for sensitive groupsUnhealthyVery unhealthyHazardous
County90th %ile AQIAbove moderateMax AQI2025 days by category
El Paso County123632,122
Harris County10138172
Tarrant County9730162
Collin County9023156
Denton County8719179
Bexar County8011154
Dallas County7711304
Parker County619147
Brazoria County718143
Cameron County768139
Galveston County688179
Montgomery County678133
Nueces County768137
Travis County716129
Webb County715121
Bell County654140
Hidalgo County694140
Hood County614122
Jefferson County673160
McLennan County653142
Culberson County672159
Ector County582183
Kaufman County602126
Lubbock County462167
Rockwall County452108
Bowie County591107
Brewster County641164
Gregg County541115
Hunt County501119
Johnson County581101
Kleberg County741107
Navarro County651107
Polk County481105
Atascosa County61092
Brazos County57078
Ellis County51093
Harrison County590100
Karnes County16032
Maverick County62090
Orange County59090
Potter County41085
Randall County61097
Smith County50093
Victoria County580100
Wilson County19041

EPA Air Quality System annual summaries by county, 2025. The 90th percentile AQI describes a day worse than nine out of ten, which is a steadier measure than the annual maximum a single wildfire can set.

Not measured

209 counties without a monitor

No EPA monitor reported from these counties, so there is no air quality record to publish. Their radon zone is known, and radon is measured in the building rather than the air outside it.

Other states

Air quality elsewhere