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)

Franklin County had the highest share of days with good air quality (US EPA AQI) of 34 counties in 2010, at 99.7%. New York County had the lowest, at 26.6%. The median was 76%. Source: EPA.

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Highest99.7Franklin County
Lowest26.6New York County
Median7634 counties

Map of counties, 2010

Albany County: 60 %Bronx County: 35.3 %Chautauqua County: 74.2 %Chemung County: 89 %Dutchess County: 88.6 %Erie County: 40.8 %Essex County: 77.8 %Franklin County: 99.7 %Hamilton County: 92.2 %Herkimer County: 92.5 %Jefferson County: 89 %Kings County: 52.2 %Madison County: 88.1 %Monroe County: 68.2 %Nassau County: 57.3 %New York County: 26.6 %Niagara County: 57.3 %Oneida County: 71.8 %Onondaga County: 84.4 %Orange County: 61.7 %Oswego County: 87.9 %Putnam County: 86.1 %Queens County: 44.7 %Rensselaer County: 87.1 %Richmond County: 55.9 %Rockland County: 67.9 %Saratoga County: 90.9 %Schenectady County: 93.4 %Steuben County: 71.2 %Suffolk County: 67.7 %Tompkins County: 86.4 %Ulster County: 87.3 %Wayne County: 87 %Westchester County: 65.2 %
  • Under 57
  • 57 to 68
  • 68 to 76
  • 76 to 87
  • 87 to 89
  • 89 and over
  • No data
%, 2010. 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, 2010

Franklin County: 99.7 %Franklin County99.7Schenectady County: 93.4 %Schenectady County93.4Herkimer County: 92.5 %Herkimer County92.5Hamilton County: 92.2 %Hamilton County92.2Saratoga County: 90.9 %Saratoga County90.9Chemung County: 89 %Chemung County89Jefferson County: 89 %Jefferson County89Dutchess County: 88.6 %Dutchess County88.6Madison County: 88.1 %Madison County88.1Oswego County: 87.9 %Oswego County87.9Ulster County: 87.3 %Ulster County87.3Rensselaer County: 87.1 %Rensselaer County87.1Wayne County: 87 %Wayne County87Tompkins County: 86.4 %Tompkins County86.4Putnam County: 86.1 %Putnam County86.1Onondaga County: 84.4 %Onondaga County84.4Essex County: 77.8 %Essex County77.8Chautauqua County: 74.2 %Chautauqua County74.2Oneida County: 71.8 %Oneida County71.8Steuben County: 71.2 %Steuben County71.2Monroe County: 68.2 %Monroe County68.2Rockland County: 67.9 %Rockland County67.9Suffolk County: 67.7 %Suffolk County67.7Westchester County: 65.2 %Westchester County65.2Orange County: 61.7 %Orange County61.7Albany County: 60 %Albany County60Nassau County: 57.3 %Nassau County57.3Niagara County: 57.3 %Niagara County57.3Richmond County: 55.9 %Richmond County55.9Kings County: 52.2 %Kings County52.2Queens County: 44.7 %Queens County44.7Erie County: 40.8 %Erie County40.8Bronx County: 35.3 %Bronx County35.3New York County: 26.6 %New York County26.6Franklin County: 99.7 %Franklin County99.7Schenectady County: 93.4 %Schenectady County93.4Herkimer County: 92.5 %Herkimer County92.5Hamilton County: 92.2 %Hamilton County92.2Saratoga County: 90.9 %Saratoga County90.9Chemung County: 89 %Chemung County89Jefferson County: 89 %Jefferson County89Dutchess County: 88.6 %Dutchess County88.6Madison County: 88.1 %Madison County88.1Oswego County: 87.9 %Oswego County87.9Ulster County: 87.3 %Ulster County87.3Rensselaer County: 87.1 %Rensselaer County87.1Wayne County: 87 %Wayne County87Tompkins County: 86.4 %Tompkins County86.4Putnam County: 86.1 %Putnam County86.1Onondaga County: 84.4 %Onondaga County84.4Essex County: 77.8 %Essex County77.8Chautauqua County: 74.2 %Chautauqua County74.2Oneida County: 71.8 %Oneida County71.8Steuben County: 71.2 %Steuben County71.2Monroe County: 68.2 %Monroe County68.2Rockland County: 67.9 %Rockland County67.9Suffolk County: 67.7 %Suffolk County67.7Westchester County: 65.2 %Westchester County65.2Orange County: 61.7 %Orange County61.7Albany County: 60 %Albany County60Nassau County: 57.3 %Nassau County57.3Niagara County: 57.3 %Niagara County57.3Richmond County: 55.9 %Richmond County55.9Kings County: 52.2 %Kings County52.2Queens County: 44.7 %Queens County44.7Erie County: 40.8 %Erie County40.8Bronx County: 35.3 %Bronx County35.3New York County: 26.6 %New York County26.6
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties2010 (%)Change on 2009
1Franklin County99.7+2.2 pts
2Schenectady County93.4-3.8 pts
3Herkimer County92.5-0.9 pts
4Hamilton County92.2+0.2 pts
5Saratoga County90.9-1.7 pts
6Chemung County89-4.7 pts
6Jefferson County89-3.3 pts
8Dutchess County88.6-4.8 pts
9Madison County88.1-6.1 pts
10Oswego County87.9-8.6 pts
11Ulster County87.3-5.5 pts
12Rensselaer County87.1-6.3 pts
13Wayne County87-4.2 pts
14Tompkins County86.4-8.1 pts
15Putnam County86.1-8.4 pts
16Onondaga County84.4-3.5 pts
17Essex County77.8-1.9 pts
18Chautauqua County74.2-6.9 pts
19Oneida County71.8+3.6 pts
20Steuben County71.2-0.9 pts
21Monroe County68.2-0.8 pts
22Rockland County67.9-12.8 pts
23Suffolk County67.7-11.2 pts
24Westchester County65.2-2.2 pts
25Orange County61.7-2.1 pts
26Albany County600 pts
27Nassau County57.3+1.1 pts
27Niagara County57.30 pts
29Richmond County55.9+4.7 pts
30Kings County52.2+11.9 pts
31Queens County44.7+1.4 pts
32Erie County40.8+5.2 pts
33Bronx County35.3+1.1 pts
34New York County26.60 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. 5 counties with data in other periods have no value for 2010 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), 2010) [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), 2010. 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?period=2010. 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), 2010. 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?period=2010.

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), 2010 [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?period=2010 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_new_york_2010,
  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), 2010}},
  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?period=2010. 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), 2010
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?period=2010
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/new-york-counties?period=2010.
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)?

Franklin County, with 99.7% in 2010, according to EPA.

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

New York County, with 26.6% in 2010.

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. 5 counties have no value for 2010 and are not ranked.

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

Counties in New York: more rankings