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Air quality in New Mexico

EPA monitors report from 16 of New Mexico’s 33 counties. That is the honest limit of this page: the other 17 are not measured, not clean. In 2025 the most affected monitored county was Doña Ana County, with 48 days above the moderate category.

16
Counties with monitors
17
Counties without
123
Days above moderate, 2025
Summed across monitored counties
9.9%
Adults with asthma
Population-weighted county estimate

County by county

Monitored New Mexico counties

GoodModerateUnhealthy for sensitive groupsUnhealthyVery unhealthyHazardous
County90th %ile AQIAbove moderateMax AQI2025 days by category
Doña Ana County11548528
Eddy County9025168
Bernalillo County8821204
Luna County6818321
Lea County648193
Chaves County472117
Lincoln County751108
Catron County740100
Los Alamos County27042
Rio Arriba County54087
San Juan County74097
Sandoval County64093
Santa Fe County58093
Socorro County36085
Taos County32052
Valencia County64097

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

17 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