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 2008, at 97%. New York County had the lowest, at 18%. The median was 79.5%. Source: EPA.

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Highest97Franklin County
Lowest18New York County
Median79.534 counties

Map of counties, 2008

Albany County: 45.9 %Bronx County: 24.6 %Chautauqua County: 77 %Chemung County: 91.7 %Dutchess County: 89.7 %Erie County: 25.1 %Essex County: 72.7 %Franklin County: 97 %Hamilton County: 90.3 %Herkimer County: 92.5 %Jefferson County: 86.6 %Kings County: 32.8 %Madison County: 89.8 %Monroe County: 57.9 %Nassau County: 41.5 %New York County: 18 %Niagara County: 42.3 %Oneida County: 50.3 %Onondaga County: 82 %Orange County: 51.9 %Oswego County: 84.5 %Putnam County: 88 %Queens County: 31.1 %Rensselaer County: 89.1 %Richmond County: 37.4 %St. Lawrence County: 84.4 %Saratoga County: 90 %Schenectady County: 95.1 %Steuben County: 61.3 %Suffolk County: 69.1 %Tompkins County: 91.4 %Ulster County: 92.4 %Wayne County: 82.1 %Westchester County: 56.7 %
  • Under 39
  • 39 to 57
  • 57 to 80
  • 80 to 88
  • 88 to 91
  • 91 and over
  • No data
%, 2008. 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, 2008

Franklin County: 97 %Franklin County97Schenectady County: 95.1 %Schenectady County95.1Herkimer County: 92.5 %Herkimer County92.5Ulster County: 92.4 %Ulster County92.4Chemung County: 91.7 %Chemung County91.7Tompkins County: 91.4 %Tompkins County91.4Hamilton County: 90.3 %Hamilton County90.3Saratoga County: 90 %Saratoga County90Madison County: 89.8 %Madison County89.8Dutchess County: 89.7 %Dutchess County89.7Rensselaer County: 89.1 %Rensselaer County89.1Putnam County: 88 %Putnam County88Jefferson County: 86.6 %Jefferson County86.6Oswego County: 84.5 %Oswego County84.5St. Lawrence County: 84.4 %St. Lawrence County84.4Wayne County: 82.1 %Wayne County82.1Onondaga County: 82 %Onondaga County82Chautauqua County: 77 %Chautauqua County77Essex County: 72.7 %Essex County72.7Suffolk County: 69.1 %Suffolk County69.1Steuben County: 61.3 %Steuben County61.3Monroe County: 57.9 %Monroe County57.9Westchester County: 56.7 %Westchester County56.7Orange County: 51.9 %Orange County51.9Oneida County: 50.3 %Oneida County50.3Albany County: 45.9 %Albany County45.9Niagara County: 42.3 %Niagara County42.3Nassau County: 41.5 %Nassau County41.5Richmond County: 37.4 %Richmond County37.4Kings County: 32.8 %Kings County32.8Queens County: 31.1 %Queens County31.1Erie County: 25.1 %Erie County25.1Bronx County: 24.6 %Bronx County24.6New York County: 18 %New York County18Franklin County: 97 %Franklin County97Schenectady County: 95.1 %Schenectady County95.1Herkimer County: 92.5 %Herkimer County92.5Ulster County: 92.4 %Ulster County92.4Chemung County: 91.7 %Chemung County91.7Tompkins County: 91.4 %Tompkins County91.4Hamilton County: 90.3 %Hamilton County90.3Saratoga County: 90 %Saratoga County90Madison County: 89.8 %Madison County89.8Dutchess County: 89.7 %Dutchess County89.7Rensselaer County: 89.1 %Rensselaer County89.1Putnam County: 88 %Putnam County88Jefferson County: 86.6 %Jefferson County86.6Oswego County: 84.5 %Oswego County84.5St. Lawrence County: 84.4 %St. Lawrence County84.4Wayne County: 82.1 %Wayne County82.1Onondaga County: 82 %Onondaga County82Chautauqua County: 77 %Chautauqua County77Essex County: 72.7 %Essex County72.7Suffolk County: 69.1 %Suffolk County69.1Steuben County: 61.3 %Steuben County61.3Monroe County: 57.9 %Monroe County57.9Westchester County: 56.7 %Westchester County56.7Orange County: 51.9 %Orange County51.9Oneida County: 50.3 %Oneida County50.3Albany County: 45.9 %Albany County45.9Niagara County: 42.3 %Niagara County42.3Nassau County: 41.5 %Nassau County41.5Richmond County: 37.4 %Richmond County37.4Kings County: 32.8 %Kings County32.8Queens County: 31.1 %Queens County31.1Erie County: 25.1 %Erie County25.1Bronx County: 24.6 %Bronx County24.6New York County: 18 %New York County18
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties2008 (%)Change on 2007
1Franklin County97+3.1 pts
2Schenectady County95.1+1.7 pts
3Herkimer County92.5-0.7 pts
4Ulster County92.4+4.9 pts
5Chemung County91.7+4.3 pts
6Tompkins County91.4+6.6 pts
7Hamilton County90.3+1.2 pts
8Saratoga County90+1.6 pts
9Madison County89.8+3.8 pts
10Dutchess County89.7+0.8 pts
11Rensselaer County89.1+0.5 pts
12Putnam County88+3 pts
13Jefferson County86.6+4.6 pts
14Oswego County84.5+5.1 pts
15St. Lawrence County84.4-2.4 pts
16Wayne County82.1+4 pts
17Onondaga County82+2 pts
18Chautauqua County77+6.6 pts
19Essex County72.7-0.7 pts
20Suffolk County69.1-2.7 pts
21Steuben County61.3+2.9 pts
22Monroe County57.9-4.6 pts
23Westchester County56.7+1.8 pts
24Orange County51.9-3.7 pts
25Oneida County50.3-4.8 pts
26Albany County45.9-5.1 pts
27Niagara County42.3-4.5 pts
28Nassau County41.5-4.9 pts
29Richmond County37.4-6.4 pts
30Kings County32.8-2.7 pts
31Queens County31.1-6.4 pts
32Erie County25.1-6.4 pts
33Bronx County24.6-5.5 pts
34New York County18+0.5 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 2008 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), 2008) [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), 2008. 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=2008. 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), 2008. 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=2008.

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), 2008 [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=2008 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_new_york_2008,
  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), 2008}},
  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=2008. 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), 2008
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=2008
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/new-york-counties?period=2008.
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 97% in 2008, according to EPA.

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

New York County, with 18% in 2008.

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 2008 and are not ranked.

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

Counties in New York: more rankings