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Air quality in New York

EPA monitors report from 27 of New York’s 62 counties. That is the honest limit of this page: the other 35 are not measured, not clean. In 2025 the most affected monitored county was Erie County, with 11 days above the moderate category.

27
Counties with monitors
35
Counties without
83
Days above moderate, 2025
Summed across monitored counties
10.3%
Adults with asthma
Population-weighted county estimate

County by county

Monitored New York counties

GoodModerateUnhealthy for sensitive groupsUnhealthyVery unhealthyHazardous
County90th %ile AQIAbove moderateMax AQI2025 days by category
Erie County6711140
Bronx County678143
Monroe County617135
Queens County647154
Rockland County567136
New York County696136
Westchester County566136
Albany County645136
Essex County615159
Suffolk County645154
Onondaga County574125
Dutchess County463140
Richmond County613129
Steuben County573143
Chautauqua County521108
Niagara County481115
Orange County531108
Hamilton County44087
Jefferson County47087
Kings County63099
Nassau County58092
Oneida County54099
Oswego County44080
Putnam County46097
Saratoga County44093
Tompkins County47074
Wayne County45090

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

35 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