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 35 counties in 2009, at 97.5%. New York County had the lowest, at 26.6%. The median was 81.1%. Source: EPA.

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Highest97.5Franklin County
Lowest26.6New York County
Median81.135 counties

Map of counties, 2009

Albany County: 60 %Bronx County: 34.2 %Chautauqua County: 81.1 %Chemung County: 93.7 %Dutchess County: 93.4 %Erie County: 35.6 %Essex County: 79.7 %Franklin County: 97.5 %Hamilton County: 92 %Herkimer County: 93.4 %Jefferson County: 92.3 %Kings County: 40.3 %Madison County: 94.2 %Monroe County: 69 %Nassau County: 56.2 %New York County: 26.6 %Niagara County: 57.3 %Oneida County: 68.2 %Onondaga County: 87.9 %Orange County: 63.8 %Oswego County: 96.5 %Putnam County: 94.5 %Queens County: 43.3 %Rensselaer County: 93.4 %Richmond County: 51.2 %Rockland County: 80.7 %St. Lawrence County: 84.6 %Saratoga County: 92.6 %Schenectady County: 97.2 %Steuben County: 72.1 %Suffolk County: 78.9 %Tompkins County: 94.5 %Ulster County: 92.8 %Wayne County: 91.2 %Westchester County: 67.4 %
  • Under 55
  • 55 to 68
  • 68 to 81
  • 81 to 93
  • 93 to 94
  • 94 and over
  • No data
%, 2009. 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, 2009

Franklin County: 97.5 %Franklin County97.5Schenectady County: 97.2 %Schenectady County97.2Oswego County: 96.5 %Oswego County96.5Putnam County: 94.5 %Putnam County94.5Tompkins County: 94.5 %Tompkins County94.5Madison County: 94.2 %Madison County94.2Chemung County: 93.7 %Chemung County93.7Dutchess County: 93.4 %Dutchess County93.4Herkimer County: 93.4 %Herkimer County93.4Rensselaer County: 93.4 %Rensselaer County93.4Ulster County: 92.8 %Ulster County92.8Saratoga County: 92.6 %Saratoga County92.6Jefferson County: 92.3 %Jefferson County92.3Hamilton County: 92 %Hamilton County92Wayne County: 91.2 %Wayne County91.2Onondaga County: 87.9 %Onondaga County87.9St. Lawrence County: 84.6 %St. Lawrence County84.6Chautauqua County: 81.1 %Chautauqua County81.1Rockland County: 80.7 %Rockland County80.7Essex County: 79.7 %Essex County79.7Suffolk County: 78.9 %Suffolk County78.9Steuben County: 72.1 %Steuben County72.1Monroe County: 69 %Monroe County69Oneida County: 68.2 %Oneida County68.2Westchester County: 67.4 %Westchester County67.4Orange County: 63.8 %Orange County63.8Albany County: 60 %Albany County60Niagara County: 57.3 %Niagara County57.3Nassau County: 56.2 %Nassau County56.2Richmond County: 51.2 %Richmond County51.2Queens County: 43.3 %Queens County43.3Kings County: 40.3 %Kings County40.3Erie County: 35.6 %Erie County35.6Bronx County: 34.2 %Bronx County34.2New York County: 26.6 %New York County26.6Franklin County: 97.5 %Franklin County97.5Schenectady County: 97.2 %Schenectady County97.2Oswego County: 96.5 %Oswego County96.5Putnam County: 94.5 %Putnam County94.5Tompkins County: 94.5 %Tompkins County94.5Madison County: 94.2 %Madison County94.2Chemung County: 93.7 %Chemung County93.7Dutchess County: 93.4 %Dutchess County93.4Herkimer County: 93.4 %Herkimer County93.4Rensselaer County: 93.4 %Rensselaer County93.4Ulster County: 92.8 %Ulster County92.8Saratoga County: 92.6 %Saratoga County92.6Jefferson County: 92.3 %Jefferson County92.3Hamilton County: 92 %Hamilton County92Wayne County: 91.2 %Wayne County91.2Onondaga County: 87.9 %Onondaga County87.9St. Lawrence County: 84.6 %St. Lawrence County84.6Chautauqua County: 81.1 %Chautauqua County81.1Rockland County: 80.7 %Rockland County80.7Essex County: 79.7 %Essex County79.7Suffolk County: 78.9 %Suffolk County78.9Steuben County: 72.1 %Steuben County72.1Monroe County: 69 %Monroe County69Oneida County: 68.2 %Oneida County68.2Westchester County: 67.4 %Westchester County67.4Orange County: 63.8 %Orange County63.8Albany County: 60 %Albany County60Niagara County: 57.3 %Niagara County57.3Nassau County: 56.2 %Nassau County56.2Richmond County: 51.2 %Richmond County51.2Queens County: 43.3 %Queens County43.3Kings County: 40.3 %Kings County40.3Erie County: 35.6 %Erie County35.6Bronx County: 34.2 %Bronx County34.2New York County: 26.6 %New York County26.6
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties2009 (%)Change on 2008
1Franklin County97.5+0.5 pts
2Schenectady County97.2+2.1 pts
3Oswego County96.5+12 pts
4Putnam County94.5+6.5 pts
4Tompkins County94.5+3.1 pts
6Madison County94.2+4.4 pts
7Chemung County93.7+2 pts
8Dutchess County93.4+3.7 pts
8Herkimer County93.4+0.9 pts
8Rensselaer County93.4+4.3 pts
11Ulster County92.8+0.4 pts
12Saratoga County92.6+2.6 pts
13Jefferson County92.3+5.7 pts
14Hamilton County92+1.7 pts
15Wayne County91.2+9.1 pts
16Onondaga County87.9+5.9 pts
17St. Lawrence County84.6+0.2 pts
18Chautauqua County81.1+4.1 pts
19Rockland County80.7n/a
20Essex County79.7+7 pts
21Suffolk County78.9+9.8 pts
22Steuben County72.1+10.8 pts
23Monroe County69+11.1 pts
24Oneida County68.2+17.9 pts
25Westchester County67.4+10.7 pts
26Orange County63.8+11.9 pts
27Albany County60+14.1 pts
28Niagara County57.3+15 pts
29Nassau County56.2+14.7 pts
30Richmond County51.2+13.8 pts
31Queens County43.3+12.2 pts
32Kings County40.3+7.5 pts
33Erie County35.6+10.5 pts
34Bronx County34.2+9.6 pts
35New York County26.6+8.6 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. 4 counties with data in other periods have no value for 2009 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), 2009) [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), 2009. 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=2009. 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), 2009. 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=2009.

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), 2009 [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=2009 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_new_york_2009,
  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), 2009}},
  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=2009. 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), 2009
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=2009
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/new-york-counties?period=2009.
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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Rank Counties in New York by share of days with good air quality (US EPA AQI) using official data, and cite the source.
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Questions

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

Franklin County, with 97.5% in 2009, 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 2009.

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. 4 counties have no value for 2009 and are not ranked.

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

Counties in New York: more rankings