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 2004, at 99.7%. Bronx County had the lowest, at 27.3%. The median was 81.8%. Source: EPA.

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Highest99.7Franklin County
Lowest27.3Bronx County
Median81.834 counties

Map of counties, 2004

Albany County: 76.9 %Bronx County: 27.3 %Chautauqua County: 71.8 %Chemung County: 93.5 %Dutchess County: 94.6 %Erie County: 64.5 %Essex County: 75.1 %Franklin County: 99.7 %Hamilton County: 89 %Herkimer County: 94.2 %Jefferson County: 84.3 %Kings County: 81.1 %Madison County: 91.1 %Monroe County: 82.8 %Nassau County: 76.2 %New York County: 60.9 %Niagara County: 76.2 %Oneida County: 91.1 %Onondaga County: 88.5 %Orange County: 66.7 %Oswego County: 83.8 %Putnam County: 80.5 %Queens County: 40.2 %Rensselaer County: 86.8 %Richmond County: 59.8 %St. Lawrence County: 72.8 %Saratoga County: 88.4 %Schenectady County: 95.1 %Steuben County: 60.9 %Suffolk County: 73.5 %Tompkins County: 82.4 %Ulster County: 87.6 %Wayne County: 90.1 %Westchester County: 80.3 %
  • Under 66
  • 66 to 76
  • 76 to 82
  • 82 to 88
  • 88 to 91
  • 91 and over
  • No data
%, 2004. 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, 2004

Franklin County: 99.7 %Franklin County99.7Schenectady County: 95.1 %Schenectady County95.1Dutchess County: 94.6 %Dutchess County94.6Herkimer County: 94.2 %Herkimer County94.2Chemung County: 93.5 %Chemung County93.5Madison County: 91.1 %Madison County91.1Oneida County: 91.1 %Oneida County91.1Wayne County: 90.1 %Wayne County90.1Hamilton County: 89 %Hamilton County89Onondaga County: 88.5 %Onondaga County88.5Saratoga County: 88.4 %Saratoga County88.4Ulster County: 87.6 %Ulster County87.6Rensselaer County: 86.8 %Rensselaer County86.8Jefferson County: 84.3 %Jefferson County84.3Oswego County: 83.8 %Oswego County83.8Monroe County: 82.8 %Monroe County82.8Tompkins County: 82.4 %Tompkins County82.4Kings County: 81.1 %Kings County81.1Putnam County: 80.5 %Putnam County80.5Westchester County: 80.3 %Westchester County80.3Albany County: 76.9 %Albany County76.9Nassau County: 76.2 %Nassau County76.2Niagara County: 76.2 %Niagara County76.2Essex County: 75.1 %Essex County75.1Suffolk County: 73.5 %Suffolk County73.5St. Lawrence County: 72.8 %St. Lawrence County72.8Chautauqua County: 71.8 %Chautauqua County71.8Orange County: 66.7 %Orange County66.7Erie County: 64.5 %Erie County64.5New York County: 60.9 %New York County60.9Steuben County: 60.9 %Steuben County60.9Richmond County: 59.8 %Richmond County59.8Queens County: 40.2 %Queens County40.2Bronx County: 27.3 %Bronx County27.3Franklin County: 99.7 %Franklin County99.7Schenectady County: 95.1 %Schenectady County95.1Dutchess County: 94.6 %Dutchess County94.6Herkimer County: 94.2 %Herkimer County94.2Chemung County: 93.5 %Chemung County93.5Madison County: 91.1 %Madison County91.1Oneida County: 91.1 %Oneida County91.1Wayne County: 90.1 %Wayne County90.1Hamilton County: 89 %Hamilton County89Onondaga County: 88.5 %Onondaga County88.5Saratoga County: 88.4 %Saratoga County88.4Ulster County: 87.6 %Ulster County87.6Rensselaer County: 86.8 %Rensselaer County86.8Jefferson County: 84.3 %Jefferson County84.3Oswego County: 83.8 %Oswego County83.8Monroe County: 82.8 %Monroe County82.8Tompkins County: 82.4 %Tompkins County82.4Kings County: 81.1 %Kings County81.1Putnam County: 80.5 %Putnam County80.5Westchester County: 80.3 %Westchester County80.3Albany County: 76.9 %Albany County76.9Nassau County: 76.2 %Nassau County76.2Niagara County: 76.2 %Niagara County76.2Essex County: 75.1 %Essex County75.1Suffolk County: 73.5 %Suffolk County73.5St. Lawrence County: 72.8 %St. Lawrence County72.8Chautauqua County: 71.8 %Chautauqua County71.8Orange County: 66.7 %Orange County66.7Erie County: 64.5 %Erie County64.5New York County: 60.9 %New York County60.9Steuben County: 60.9 %Steuben County60.9Richmond County: 59.8 %Richmond County59.8Queens County: 40.2 %Queens County40.2Bronx County: 27.3 %Bronx County27.3
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties2004 (%)Change on 2003
1Franklin County99.70 pts
2Schenectady County95.1+7.7 pts
3Dutchess County94.6+12.1 pts
4Herkimer County94.2+2.6 pts
5Chemung County93.5+4.6 pts
6Madison County91.1+7.2 pts
6Oneida County91.1+11 pts
8Wayne County90.1+5.1 pts
9Hamilton County89-0.1 pts
10Onondaga County88.5+3.3 pts
11Saratoga County88.4+16.6 pts
12Ulster County87.6+3.9 pts
13Rensselaer County86.8+4.1 pts
14Jefferson County84.3+6.9 pts
15Oswego County83.8+9.6 pts
16Monroe County82.8+7.7 pts
17Tompkins County82.4+5.1 pts
18Kings County81.1+2.2 pts
19Putnam County80.5+4.6 pts
20Westchester County80.3+3.4 pts
21Albany County76.9-1.4 pts
22Nassau County76.2+1.4 pts
22Niagara County76.2+2.3 pts
24Essex County75.1+4.1 pts
25Suffolk County73.5+2 pts
26St. Lawrence County72.8-1.2 pts
27Chautauqua County71.8+1.1 pts
28Orange County66.7+3.2 pts
29Erie County64.5+5.3 pts
30New York County60.9+8.8 pts
30Steuben County60.9+3 pts
32Richmond County59.8-4.8 pts
33Queens County40.2+5 pts
34Bronx County27.3-0.4 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 2004 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), 2004) [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), 2004. 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=2004. 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), 2004. 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=2004.

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), 2004 [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=2004 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_new_york_2004,
  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), 2004}},
  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=2004. 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), 2004
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=2004
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/new-york-counties?period=2004.
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 2004, according to EPA.

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

Bronx County, with 27.3% in 2004.

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 2004 and are not ranked.

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

Counties in New York: more rankings