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 2007, at 93.9%. New York County had the lowest, at 17.5%. The median was 75.8%. Source: EPA.

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Highest93.9Franklin County
Lowest17.5New York County
Median75.834 counties

Map of counties, 2007

Albany County: 51 %Bronx County: 30.1 %Chautauqua County: 70.4 %Chemung County: 87.4 %Dutchess County: 88.9 %Erie County: 31.5 %Essex County: 73.4 %Franklin County: 93.9 %Hamilton County: 89.1 %Herkimer County: 93.2 %Jefferson County: 82 %Kings County: 35.5 %Madison County: 86 %Monroe County: 62.5 %Nassau County: 46.4 %New York County: 17.5 %Niagara County: 46.8 %Oneida County: 55.1 %Onondaga County: 80 %Orange County: 55.6 %Oswego County: 79.4 %Putnam County: 85 %Queens County: 37.5 %Rensselaer County: 88.6 %Richmond County: 43.8 %St. Lawrence County: 86.8 %Saratoga County: 88.4 %Schenectady County: 93.4 %Steuben County: 58.4 %Suffolk County: 71.8 %Tompkins County: 84.8 %Ulster County: 87.5 %Wayne County: 78.1 %Westchester County: 54.9 %
  • Under 45
  • 45 to 56
  • 56 to 76
  • 76 to 85
  • 85 to 89
  • 89 and over
  • No data
%, 2007. 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, 2007

Franklin County: 93.9 %Franklin County93.9Schenectady County: 93.4 %Schenectady County93.4Herkimer County: 93.2 %Herkimer County93.2Hamilton County: 89.1 %Hamilton County89.1Dutchess County: 88.9 %Dutchess County88.9Rensselaer County: 88.6 %Rensselaer County88.6Saratoga County: 88.4 %Saratoga County88.4Ulster County: 87.5 %Ulster County87.5Chemung County: 87.4 %Chemung County87.4St. Lawrence County: 86.8 %St. Lawrence County86.8Madison County: 86 %Madison County86Putnam County: 85 %Putnam County85Tompkins County: 84.8 %Tompkins County84.8Jefferson County: 82 %Jefferson County82Onondaga County: 80 %Onondaga County80Oswego County: 79.4 %Oswego County79.4Wayne County: 78.1 %Wayne County78.1Essex County: 73.4 %Essex County73.4Suffolk County: 71.8 %Suffolk County71.8Chautauqua County: 70.4 %Chautauqua County70.4Monroe County: 62.5 %Monroe County62.5Steuben County: 58.4 %Steuben County58.4Orange County: 55.6 %Orange County55.6Oneida County: 55.1 %Oneida County55.1Westchester County: 54.9 %Westchester County54.9Albany County: 51 %Albany County51Niagara County: 46.8 %Niagara County46.8Nassau County: 46.4 %Nassau County46.4Richmond County: 43.8 %Richmond County43.8Queens County: 37.5 %Queens County37.5Kings County: 35.5 %Kings County35.5Erie County: 31.5 %Erie County31.5Bronx County: 30.1 %Bronx County30.1New York County: 17.5 %New York County17.5Franklin County: 93.9 %Franklin County93.9Schenectady County: 93.4 %Schenectady County93.4Herkimer County: 93.2 %Herkimer County93.2Hamilton County: 89.1 %Hamilton County89.1Dutchess County: 88.9 %Dutchess County88.9Rensselaer County: 88.6 %Rensselaer County88.6Saratoga County: 88.4 %Saratoga County88.4Ulster County: 87.5 %Ulster County87.5Chemung County: 87.4 %Chemung County87.4St. Lawrence County: 86.8 %St. Lawrence County86.8Madison County: 86 %Madison County86Putnam County: 85 %Putnam County85Tompkins County: 84.8 %Tompkins County84.8Jefferson County: 82 %Jefferson County82Onondaga County: 80 %Onondaga County80Oswego County: 79.4 %Oswego County79.4Wayne County: 78.1 %Wayne County78.1Essex County: 73.4 %Essex County73.4Suffolk County: 71.8 %Suffolk County71.8Chautauqua County: 70.4 %Chautauqua County70.4Monroe County: 62.5 %Monroe County62.5Steuben County: 58.4 %Steuben County58.4Orange County: 55.6 %Orange County55.6Oneida County: 55.1 %Oneida County55.1Westchester County: 54.9 %Westchester County54.9Albany County: 51 %Albany County51Niagara County: 46.8 %Niagara County46.8Nassau County: 46.4 %Nassau County46.4Richmond County: 43.8 %Richmond County43.8Queens County: 37.5 %Queens County37.5Kings County: 35.5 %Kings County35.5Erie County: 31.5 %Erie County31.5Bronx County: 30.1 %Bronx County30.1New York County: 17.5 %New York County17.5
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties2007 (%)Change on 2006
1Franklin County93.9-0.9 pts
2Schenectady County93.4-3.6 pts
3Herkimer County93.2-1.2 pts
4Hamilton County89.1-2.2 pts
5Dutchess County88.9-6 pts
6Rensselaer County88.6-0.9 pts
7Saratoga County88.4-1.9 pts
8Ulster County87.5-0.8 pts
9Chemung County87.4-4.5 pts
10St. Lawrence County86.8+7.8 pts
11Madison County86-4.5 pts
12Putnam County85-3.3 pts
13Tompkins County84.8-2.6 pts
14Jefferson County82-4.9 pts
15Onondaga County80-5.2 pts
16Oswego County79.4-1.4 pts
17Wayne County78.1-10.5 pts
18Essex County73.4-3.3 pts
19Suffolk County71.8+1.4 pts
20Chautauqua County70.4-3.3 pts
21Monroe County62.5-15.9 pts
22Steuben County58.4-6.8 pts
23Orange County55.6-17.1 pts
24Oneida County55.1-33.2 pts
25Westchester County54.9-20.3 pts
26Albany County51-32.3 pts
27Niagara County46.8-27.7 pts
28Nassau County46.4-33.8 pts
29Richmond County43.8-15.4 pts
30Queens County37.5-11.5 pts
31Kings County35.5-46.7 pts
32Erie County31.5-32.3 pts
33Bronx County30.1-9.6 pts
34New York County17.5-31.8 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 2007 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), 2007) [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), 2007. 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=2007. 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), 2007. 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=2007.

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), 2007 [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=2007 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_new_york_2007,
  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), 2007}},
  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=2007. 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), 2007
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=2007
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/new-york-counties?period=2007.
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 93.9% in 2007, according to EPA.

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

New York County, with 17.5% in 2007.

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 2007 and are not ranked.

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

Counties in New York: more rankings