Data / Rankings / Share of days with good air quality (US EPA AQI) / Counties in New York

Counties in New York by share of days with good air quality (US EPA AQI), 2012

Madison County had the highest share of days with good air quality (US EPA AQI) of 33 counties in 2012, at 100%. New York County had the lowest, at 38%. The median was 80.9%. Source: EPA.

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Highest100Madison County
Lowest38New York County
Median80.933 counties

Map of counties, 2012

Albany County: 71.3 %Bronx County: 41.5 %Chautauqua County: 76.5 %Chemung County: 90.3 %Dutchess County: 91 %Erie County: 42.6 %Essex County: 80.9 %Franklin County: 99.7 %Hamilton County: 88.8 %Herkimer County: 94.7 %Jefferson County: 90.9 %Kings County: 48.5 %Madison County: 100 %Monroe County: 65.3 %Nassau County: 53.9 %New York County: 38 %Niagara County: 49.9 %Oneida County: 66.7 %Onondaga County: 85.5 %Orange County: 69.7 %Oswego County: 90.5 %Putnam County: 93 %Queens County: 51.9 %Rensselaer County: 93.4 %Richmond County: 49.3 %Rockland County: 68.6 %Saratoga County: 93.4 %Steuben County: 86.9 %Suffolk County: 63.8 %Tompkins County: 87.1 %Ulster County: 89 %Wayne County: 86 %Westchester County: 66.7 %
  • Under 51
  • 51 to 67
  • 67 to 81
  • 81 to 89
  • 89 to 92
  • 92 and over
  • No data
%, 2012. Hatched areas have no value for this period. Source: Invokely calculation with data from EPA. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2012

Madison County: 100 %Madison County100Franklin County: 99.7 %Franklin County99.7Herkimer County: 94.7 %Herkimer County94.7Rensselaer County: 93.4 %Rensselaer County93.4Saratoga County: 93.4 %Saratoga County93.4Putnam County: 93 %Putnam County93Dutchess County: 91 %Dutchess County91Jefferson County: 90.9 %Jefferson County90.9Oswego County: 90.5 %Oswego County90.5Chemung County: 90.3 %Chemung County90.3Ulster County: 89 %Ulster County89Hamilton County: 88.8 %Hamilton County88.8Tompkins County: 87.1 %Tompkins County87.1Steuben County: 86.9 %Steuben County86.9Wayne County: 86 %Wayne County86Onondaga County: 85.5 %Onondaga County85.5Essex County: 80.9 %Essex County80.9Chautauqua County: 76.5 %Chautauqua County76.5Albany County: 71.3 %Albany County71.3Orange County: 69.7 %Orange County69.7Rockland County: 68.6 %Rockland County68.6Oneida County: 66.7 %Oneida County66.7Westchester County: 66.7 %Westchester County66.7Monroe County: 65.3 %Monroe County65.3Suffolk County: 63.8 %Suffolk County63.8Nassau County: 53.9 %Nassau County53.9Queens County: 51.9 %Queens County51.9Niagara County: 49.9 %Niagara County49.9Richmond County: 49.3 %Richmond County49.3Kings County: 48.5 %Kings County48.5Erie County: 42.6 %Erie County42.6Bronx County: 41.5 %Bronx County41.5New York County: 38 %New York County38Madison County: 100 %Madison County100Franklin County: 99.7 %Franklin County99.7Herkimer County: 94.7 %Herkimer County94.7Rensselaer County: 93.4 %Rensselaer County93.4Saratoga County: 93.4 %Saratoga County93.4Putnam County: 93 %Putnam County93Dutchess County: 91 %Dutchess County91Jefferson County: 90.9 %Jefferson County90.9Oswego County: 90.5 %Oswego County90.5Chemung County: 90.3 %Chemung County90.3Ulster County: 89 %Ulster County89Hamilton County: 88.8 %Hamilton County88.8Tompkins County: 87.1 %Tompkins County87.1Steuben County: 86.9 %Steuben County86.9Wayne County: 86 %Wayne County86Onondaga County: 85.5 %Onondaga County85.5Essex County: 80.9 %Essex County80.9Chautauqua County: 76.5 %Chautauqua County76.5Albany County: 71.3 %Albany County71.3Orange County: 69.7 %Orange County69.7Rockland County: 68.6 %Rockland County68.6Oneida County: 66.7 %Oneida County66.7Westchester County: 66.7 %Westchester County66.7Monroe County: 65.3 %Monroe County65.3Suffolk County: 63.8 %Suffolk County63.8Nassau County: 53.9 %Nassau County53.9Queens County: 51.9 %Queens County51.9Niagara County: 49.9 %Niagara County49.9Richmond County: 49.3 %Richmond County49.3Kings County: 48.5 %Kings County48.5Erie County: 42.6 %Erie County42.6Bronx County: 41.5 %Bronx County41.5New York County: 38 %New York County38
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties2012 (%)Change on 2011
1Madison County100+4.5 pts
2Franklin County99.7+1.1 pts
3Herkimer County94.7-1.3 pts
4Rensselaer County93.4-2 pts
4Saratoga County93.4-0.2 pts
6Putnam County93-1.2 pts
7Dutchess County91-2.1 pts
8Jefferson County90.9-4.1 pts
9Oswego County90.5-2.7 pts
10Chemung County90.3+0.4 pts
11Ulster County89-2.7 pts
12Hamilton County88.8-6.6 pts
13Tompkins County87.1-6 pts
14Steuben County86.9+4.4 pts
15Wayne County86-11.7 pts
16Onondaga County85.5-1.6 pts
17Essex County80.9-3.4 pts
18Chautauqua County76.5-3.8 pts
19Albany County71.3+15.7 pts
20Orange County69.7+10 pts
21Rockland County68.6+5.4 pts
22Oneida County66.7+0.7 pts
22Westchester County66.7+9.5 pts
24Monroe County65.3-8.6 pts
25Suffolk County63.8+8.7 pts
26Nassau County53.9+7.5 pts
27Queens County51.9+9.4 pts
28Niagara County49.9+1.3 pts
29Richmond County49.3+5.2 pts
30Kings County48.5+3.3 pts
31Erie County42.6+0.7 pts
32Bronx County41.5+10.8 pts
33New York County38+10.9 pts

Other periods

About this ranking

Days with a daily Air Quality Index of 0 to 50 (good) 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; both counts are stored with each value.

United States counties with air quality monitors only, about 1,000 of some 3,100 in recent years; a county without monitors has no value. The number of days with an AQI differs between counties because some monitors run only in the ozone season.

Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. 6 counties with data in other periods have no value for 2012 and are left out rather than filled from another source. Equal values share a rank.

How to cite

U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: good days 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 styles

The publisher is the author. Invokely is named only as the place the figures were read, where a style asks for it.

APA 7

U.S. Environmental Protection Agency. (2026). EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts (Counties in New York by share of days with good air quality (US EPA AQI), 2012) [Data set]. Retrieved October 12, 2026, from https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual

MLA 9

EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts, Counties in New York by share of days with good air quality (US EPA AQI), 2012. U.S. Environmental Protection Agency, 13 July 2026, https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Invokely, https://invokely.ai/rankings/good-air-quality-days-share/new-york-counties. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Environmental Protection Agency. 2026. EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts. Counties in New York by share of days with good air quality (US EPA AQI), 2012. Dataset. Accessed October 12, 2026. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Also distributed by Invokely, https://invokely.ai/rankings/good-air-quality-days-share/new-york-counties.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts, Counties in New York by share of days with good air quality (US EPA AQI), 2012 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/rankings/good-air-quality-days-share/new-york-counties (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_new_york_2012,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts: Counties in New York by share of days with good air quality (US EPA AQI), 2012}},
  year = {2026},
  howpublished = {Data set},
  url = {https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/new-york-counties. Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: good days 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.},
}
RIS
TY  - DATA
AU  - U.S. Environmental Protection Agency
TI  - EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts: Counties in New York by share of days with good air quality (US EPA AQI), 2012
PY  - 2026
DA  - 2026/07/13
PB  - U.S. Environmental Protection Agency
DB  - Invokely
UR  - https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual
L2  - https://invokely.ai/rankings/good-air-quality-days-share/new-york-counties
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/new-york-counties.
N1  - Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: good days 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.
ER  -
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Questions

Which county has the highest share of days with good air quality (US EPA AQI)?

Madison County, with 100% in 2012, according to EPA.

Which county has the lowest share of days with good air quality (US EPA AQI)?

New York County, with 38% in 2012.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: U.S. Environmental Protection Agency, EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts. Retrieved 2026-10-12. 6 counties have no value for 2012 and are not ranked.

Share of days with good air quality (US EPA AQI): other rankings

Counties in New York: more rankings