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)

Columbia County had the highest share of days with good air quality (US EPA AQI) of 36 counties in 2003, at 100%. Bronx County had the lowest, at 27.7%. The median was 76.4%. Source: EPA.

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Highest100Columbia County
Lowest27.7Bronx County
Median76.436 counties

Map of counties, 2003

Albany County: 78.3 %Bronx County: 27.7 %Broome County: 46.4 %Chautauqua County: 70.7 %Chemung County: 88.9 %Columbia County: 100 %Dutchess County: 82.5 %Erie County: 59.2 %Essex County: 71 %Franklin County: 99.7 %Hamilton County: 89.1 %Herkimer County: 91.6 %Jefferson County: 77.4 %Kings County: 78.9 %Madison County: 83.9 %Monroe County: 75.1 %Nassau County: 74.8 %New York County: 52.1 %Niagara County: 73.9 %Oneida County: 80.1 %Onondaga County: 85.2 %Orange County: 63.5 %Oswego County: 74.2 %Putnam County: 75.9 %Queens County: 35.2 %Rensselaer County: 82.7 %Richmond County: 64.6 %St. Lawrence County: 74 %Saratoga County: 71.8 %Schenectady County: 87.4 %Steuben County: 57.9 %Suffolk County: 71.5 %Tompkins County: 77.3 %Ulster County: 83.7 %Wayne County: 85 %Westchester County: 76.9 %
  • Under 63
  • 63 to 73
  • 73 to 76
  • 76 to 81
  • 81 to 86
  • 86 and over
  • No data
%, 2003. 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, 2003

Columbia County: 100 %Columbia County100Franklin County: 99.7 %Franklin County99.7Herkimer County: 91.6 %Herkimer County91.6Hamilton County: 89.1 %Hamilton County89.1Chemung County: 88.9 %Chemung County88.9Schenectady County: 87.4 %Schenectady County87.4Onondaga County: 85.2 %Onondaga County85.2Wayne County: 85 %Wayne County85Madison County: 83.9 %Madison County83.9Ulster County: 83.7 %Ulster County83.7Rensselaer County: 82.7 %Rensselaer County82.7Dutchess County: 82.5 %Dutchess County82.5Oneida County: 80.1 %Oneida County80.1Kings County: 78.9 %Kings County78.9Albany County: 78.3 %Albany County78.3Jefferson County: 77.4 %Jefferson County77.4Tompkins County: 77.3 %Tompkins County77.3Westchester County: 76.9 %Westchester County76.9Putnam County: 75.9 %Putnam County75.9Monroe County: 75.1 %Monroe County75.1Nassau County: 74.8 %Nassau County74.8Oswego County: 74.2 %Oswego County74.2St. Lawrence County: 74 %St. Lawrence County74Niagara County: 73.9 %Niagara County73.9Saratoga County: 71.8 %Saratoga County71.8Suffolk County: 71.5 %Suffolk County71.5Essex County: 71 %Essex County71Chautauqua County: 70.7 %Chautauqua County70.7Richmond County: 64.6 %Richmond County64.6Orange County: 63.5 %Orange County63.5Erie County: 59.2 %Erie County59.2Steuben County: 57.9 %Steuben County57.9New York County: 52.1 %New York County52.1Broome County: 46.4 %Broome County46.4Queens County: 35.2 %Queens County35.2Bronx County: 27.7 %Bronx County27.7Columbia County: 100 %Columbia County100Franklin County: 99.7 %Franklin County99.7Herkimer County: 91.6 %Herkimer County91.6Hamilton County: 89.1 %Hamilton County89.1Chemung County: 88.9 %Chemung County88.9Schenectady County: 87.4 %Schenectady County87.4Onondaga County: 85.2 %Onondaga County85.2Wayne County: 85 %Wayne County85Madison County: 83.9 %Madison County83.9Ulster County: 83.7 %Ulster County83.7Rensselaer County: 82.7 %Rensselaer County82.7Dutchess County: 82.5 %Dutchess County82.5Oneida County: 80.1 %Oneida County80.1Kings County: 78.9 %Kings County78.9Albany County: 78.3 %Albany County78.3Jefferson County: 77.4 %Jefferson County77.4Tompkins County: 77.3 %Tompkins County77.3Westchester County: 76.9 %Westchester County76.9Putnam County: 75.9 %Putnam County75.9Monroe County: 75.1 %Monroe County75.1Nassau County: 74.8 %Nassau County74.8Oswego County: 74.2 %Oswego County74.2St. Lawrence County: 74 %St. Lawrence County74Niagara County: 73.9 %Niagara County73.9Saratoga County: 71.8 %Saratoga County71.8Suffolk County: 71.5 %Suffolk County71.5Essex County: 71 %Essex County71Chautauqua County: 70.7 %Chautauqua County70.7Richmond County: 64.6 %Richmond County64.6Orange County: 63.5 %Orange County63.5Erie County: 59.2 %Erie County59.2Steuben County: 57.9 %Steuben County57.9New York County: 52.1 %New York County52.1Broome County: 46.4 %Broome County46.4Queens County: 35.2 %Queens County35.2Bronx County: 27.7 %Bronx County27.7
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties2003 (%)Change on 2002
1Columbia County100+6.9 pts
2Franklin County99.7+0.3 pts
3Herkimer County91.6+1.2 pts
4Hamilton County89.1+3.1 pts
5Chemung County88.9+9.8 pts
6Schenectady County87.4+10.4 pts
7Onondaga County85.2+13.4 pts
8Wayne County85+1.6 pts
9Madison County83.9+3.9 pts
10Ulster County83.7+3.1 pts
11Rensselaer County82.7+3.1 pts
12Dutchess County82.5+14.6 pts
13Oneida County80.1+13.2 pts
14Kings County78.9+4.4 pts
15Albany County78.3+4.6 pts
16Jefferson County77.4+10.9 pts
17Tompkins County77.3+3.9 pts
18Westchester County76.9+7.2 pts
19Putnam County75.9+15.8 pts
20Monroe County75.1+8.8 pts
21Nassau County74.8+1 pts
22Oswego County74.2-25.8 pts
23St. Lawrence County74+9.2 pts
24Niagara County73.9+6.5 pts
25Saratoga County71.8-11.3 pts
26Suffolk County71.5+4.7 pts
27Essex County71+2.8 pts
28Chautauqua County70.7+5.3 pts
29Richmond County64.6+15.9 pts
30Orange County63.5-2.5 pts
31Erie County59.2-0.5 pts
32Steuben County57.9+1.6 pts
33New York County52.1+2.5 pts
34Broome County46.4-0.9 pts
35Queens County35.2-4.3 pts
36Bronx County27.7-0.2 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. 3 counties with data in other periods have no value for 2003 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), 2003) [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), 2003. 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=2003. 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), 2003. 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=2003.

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), 2003 [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=2003 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_new_york_2003,
  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), 2003}},
  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=2003. 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), 2003
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=2003
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/new-york-counties?period=2003.
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)?

Columbia County, with 100% in 2003, according to EPA.

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

Bronx County, with 27.7% in 2003.

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. 3 counties have no value for 2003 and are not ranked.

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

Counties in New York: more rankings