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 2011, at 98.6%. New York County had the lowest, at 27.1%. The median was 83.4%. Source: EPA.

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Highest98.6Franklin County
Lowest27.1New York County
Median83.434 counties

Map of counties, 2011

Albany County: 55.6 %Bronx County: 30.7 %Chautauqua County: 80.3 %Chemung County: 89.9 %Dutchess County: 93.1 %Erie County: 41.9 %Essex County: 84.3 %Franklin County: 98.6 %Hamilton County: 95.4 %Herkimer County: 96 %Jefferson County: 95 %Kings County: 45.2 %Madison County: 95.5 %Monroe County: 73.9 %Nassau County: 46.4 %New York County: 27.1 %Niagara County: 48.6 %Oneida County: 66 %Onondaga County: 87.1 %Orange County: 59.7 %Oswego County: 93.2 %Putnam County: 94.2 %Queens County: 42.5 %Rensselaer County: 95.4 %Richmond County: 44.1 %Rockland County: 63.2 %Saratoga County: 93.6 %Schenectady County: 95.6 %Steuben County: 82.5 %Suffolk County: 55.1 %Tompkins County: 93.1 %Ulster County: 91.7 %Wayne County: 97.7 %Westchester County: 57.2 %
  • Under 46
  • 46 to 60
  • 60 to 83
  • 83 to 93
  • 93 to 95
  • 95 and over
  • No data
%, 2011. 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, 2011

Franklin County: 98.6 %Franklin County98.6Wayne County: 97.7 %Wayne County97.7Herkimer County: 96 %Herkimer County96Schenectady County: 95.6 %Schenectady County95.6Madison County: 95.5 %Madison County95.5Hamilton County: 95.4 %Hamilton County95.4Rensselaer County: 95.4 %Rensselaer County95.4Jefferson County: 95 %Jefferson County95Putnam County: 94.2 %Putnam County94.2Saratoga County: 93.6 %Saratoga County93.6Oswego County: 93.2 %Oswego County93.2Dutchess County: 93.1 %Dutchess County93.1Tompkins County: 93.1 %Tompkins County93.1Ulster County: 91.7 %Ulster County91.7Chemung County: 89.9 %Chemung County89.9Onondaga County: 87.1 %Onondaga County87.1Essex County: 84.3 %Essex County84.3Steuben County: 82.5 %Steuben County82.5Chautauqua County: 80.3 %Chautauqua County80.3Monroe County: 73.9 %Monroe County73.9Oneida County: 66 %Oneida County66Rockland County: 63.2 %Rockland County63.2Orange County: 59.7 %Orange County59.7Westchester County: 57.2 %Westchester County57.2Albany County: 55.6 %Albany County55.6Suffolk County: 55.1 %Suffolk County55.1Niagara County: 48.6 %Niagara County48.6Nassau County: 46.4 %Nassau County46.4Kings County: 45.2 %Kings County45.2Richmond County: 44.1 %Richmond County44.1Queens County: 42.5 %Queens County42.5Erie County: 41.9 %Erie County41.9Bronx County: 30.7 %Bronx County30.7New York County: 27.1 %New York County27.1Franklin County: 98.6 %Franklin County98.6Wayne County: 97.7 %Wayne County97.7Herkimer County: 96 %Herkimer County96Schenectady County: 95.6 %Schenectady County95.6Madison County: 95.5 %Madison County95.5Hamilton County: 95.4 %Hamilton County95.4Rensselaer County: 95.4 %Rensselaer County95.4Jefferson County: 95 %Jefferson County95Putnam County: 94.2 %Putnam County94.2Saratoga County: 93.6 %Saratoga County93.6Oswego County: 93.2 %Oswego County93.2Dutchess County: 93.1 %Dutchess County93.1Tompkins County: 93.1 %Tompkins County93.1Ulster County: 91.7 %Ulster County91.7Chemung County: 89.9 %Chemung County89.9Onondaga County: 87.1 %Onondaga County87.1Essex County: 84.3 %Essex County84.3Steuben County: 82.5 %Steuben County82.5Chautauqua County: 80.3 %Chautauqua County80.3Monroe County: 73.9 %Monroe County73.9Oneida County: 66 %Oneida County66Rockland County: 63.2 %Rockland County63.2Orange County: 59.7 %Orange County59.7Westchester County: 57.2 %Westchester County57.2Albany County: 55.6 %Albany County55.6Suffolk County: 55.1 %Suffolk County55.1Niagara County: 48.6 %Niagara County48.6Nassau County: 46.4 %Nassau County46.4Kings County: 45.2 %Kings County45.2Richmond County: 44.1 %Richmond County44.1Queens County: 42.5 %Queens County42.5Erie County: 41.9 %Erie County41.9Bronx County: 30.7 %Bronx County30.7New York County: 27.1 %New York County27.1
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties2011 (%)Change on 2010
1Franklin County98.6-1.1 pts
2Wayne County97.7+10.7 pts
3Herkimer County96+3.5 pts
4Schenectady County95.6+2.2 pts
5Madison County95.5+7.4 pts
6Hamilton County95.4+3.2 pts
6Rensselaer County95.4+8.3 pts
8Jefferson County95+6 pts
9Putnam County94.2+8.1 pts
10Saratoga County93.6+2.7 pts
11Oswego County93.2+5.3 pts
12Dutchess County93.1+4.5 pts
12Tompkins County93.1+6.7 pts
14Ulster County91.7+4.4 pts
15Chemung County89.9+0.9 pts
16Onondaga County87.1+2.7 pts
17Essex County84.3+6.5 pts
18Steuben County82.5+11.3 pts
19Chautauqua County80.3+6.1 pts
20Monroe County73.9+5.7 pts
21Oneida County66-5.8 pts
22Rockland County63.2-4.7 pts
23Orange County59.7-2 pts
24Westchester County57.2-8 pts
25Albany County55.6-4.4 pts
26Suffolk County55.1-12.6 pts
27Niagara County48.6-8.7 pts
28Nassau County46.4-10.9 pts
29Kings County45.2-7 pts
30Richmond County44.1-11.8 pts
31Queens County42.5-2.2 pts
32Erie County41.9+1.1 pts
33Bronx County30.7-4.6 pts
34New York County27.1+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 2011 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), 2011) [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), 2011. 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=2011. 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), 2011. 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=2011.

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), 2011 [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=2011 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_new_york_2011,
  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), 2011}},
  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=2011. 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), 2011
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=2011
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/new-york-counties?period=2011.
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 98.6% in 2011, according to EPA.

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

New York County, with 27.1% in 2011.

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 2011 and are not ranked.

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

Counties in New York: more rankings