# Counties in New York by share of days unhealthy for sensitive groups or worse (US EPA AQI), 2012

All 33 values come from U.S. Environmental Protection Agency for 2012, so the places are comparable. 6 counties have no value for that period and are not ranked.

- Indicator id: `aqi_unhealthy_sensitive_or_worse_days_share`
- Unit: %
- Definition: Days with a daily Air Quality Index above 100 (unhealthy for sensitive groups, unhealthy, very unhealthy or hazardous) as a percentage of the days of the year with an AQI in a US county. Calculated by Invokely from the day counts in the EPA AirData annual summaries; the counts are stored with each value.
- Source: U.S. Environmental Protection Agency, EPA AirData annual AQI by county: days with an AQI above 100 as a share of days with an AQI, calculated with stored counts (https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual)
- Retrieved: 2026-10-12
- Citation: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: days with an AQI above 100 as a share of days with an AQI, calculated with stored counts. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Retrieved 2026-10-12.
- Web page: https://invokely.ai/rankings/unhealthy-air-quality-days-share/new-york-counties

| Rank | Place | % |
|---:|---|---:|
| 1 | Chautauqua County | 4.6 |
| 2 | Richmond County | 3.9 |
| 3 | Erie County | 3.8 |
| 3 | Queens County | 3.8 |
| 5 | Bronx County | 3.6 |
| 5 | Suffolk County | 3.6 |
| 7 | Monroe County | 3.3 |
| 8 | Niagara County | 3.2 |
| 9 | Westchester County | 3 |
| 10 | Jefferson County | 2.8 |
| 11 | Rockland County | 2.5 |
| 12 | Essex County | 2.2 |
| 12 | Onondaga County | 2.2 |
| 14 | Albany County | 1.9 |
| 14 | New York County | 1.9 |
| 16 | Tompkins County | 1.7 |
| 17 | Dutchess County | 1.5 |
| 17 | Wayne County | 1.5 |
| 19 | Oswego County | 1.2 |
| 20 | Chemung County | 1.1 |
| 21 | Hamilton County | 0.9 |
| 21 | Putnam County | 0.9 |
| 21 | Rensselaer County | 0.9 |
| 24 | Oneida County | 0.5 |
| 24 | Saratoga County | 0.5 |
| 26 | Ulster County | 0.3 |
| 27 | Franklin County | 0 |
| 27 | Herkimer County | 0 |
| 27 | Kings County | 0 |
| 27 | Madison County | 0 |
| 27 | Nassau County | 0 |
| 27 | Orange County | 0 |
| 27 | Steuben County | 0 |