Data / Rankings / Share of days unhealthy for sensitive groups or worse (US EPA AQI) / Counties in New York

Counties in New York by share of days unhealthy for sensitive groups or worse (US EPA AQI)

Niagara County had the highest share of days unhealthy for sensitive groups or worse (US EPA AQI) of 34 counties in 2005, at 8.6%. St. Lawrence County had the lowest, at 0%. The median was 3.8%. Source: EPA.

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Highest8.6Niagara County
Lowest0St. Lawrence County
Median3.834 counties

Map of counties, 2005

Albany County: 3.6 %Bronx County: 5.5 %Chautauqua County: 8.2 %Chemung County: 0.9 %Dutchess County: 1.7 %Erie County: 8.5 %Essex County: 5.2 %Franklin County: 3.9 %Hamilton County: 2 %Herkimer County: 0.6 %Jefferson County: 7.8 %Kings County: 0.8 %Madison County: 2.7 %Monroe County: 3.6 %Nassau County: 0.6 %New York County: 1.6 %Niagara County: 8.6 %Oneida County: 1.4 %Onondaga County: 4.1 %Orange County: 7.2 %Oswego County: 7.8 %Putnam County: 7.7 %Queens County: 4.9 %Rensselaer County: 4.5 %Richmond County: 8.4 %St. Lawrence County: 0 %Saratoga County: 4.4 %Schenectady County: 1.9 %Steuben County: 0.6 %Suffolk County: 7.1 %Tompkins County: 3.3 %Ulster County: 3.1 %Wayne County: 0.5 %Westchester County: 6.3 %
  • Under 0.9
  • 0.9 to 2
  • 2 to 3.8
  • 3.8 to 5.2
  • 5.2 to 7.8
  • 7.8 and over
  • No data
%, 2005. 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, 2005

Niagara County: 8.6 %Niagara County8.6Erie County: 8.5 %Erie County8.5Richmond County: 8.4 %Richmond County8.4Chautauqua County: 8.2 %Chautauqua County8.2Jefferson County: 7.8 %Jefferson County7.8Oswego County: 7.8 %Oswego County7.8Putnam County: 7.7 %Putnam County7.7Orange County: 7.2 %Orange County7.2Suffolk County: 7.1 %Suffolk County7.1Westchester County: 6.3 %Westchester County6.3Bronx County: 5.5 %Bronx County5.5Essex County: 5.2 %Essex County5.2Queens County: 4.9 %Queens County4.9Rensselaer County: 4.5 %Rensselaer County4.5Saratoga County: 4.4 %Saratoga County4.4Onondaga County: 4.1 %Onondaga County4.1Franklin County: 3.9 %Franklin County3.9Albany County: 3.6 %Albany County3.6Monroe County: 3.6 %Monroe County3.6Tompkins County: 3.3 %Tompkins County3.3Ulster County: 3.1 %Ulster County3.1Madison County: 2.7 %Madison County2.7Hamilton County: 2 %Hamilton County2Schenectady County: 1.9 %Schenectady County1.9Dutchess County: 1.7 %Dutchess County1.7New York County: 1.6 %New York County1.6Oneida County: 1.4 %Oneida County1.4Chemung County: 0.9 %Chemung County0.9Kings County: 0.8 %Kings County0.8Herkimer County: 0.6 %Herkimer County0.6Nassau County: 0.6 %Nassau County0.6Steuben County: 0.6 %Steuben County0.6Wayne County: 0.5 %Wayne County0.5St. Lawrence County: 0 %St. Lawrence County0Niagara County: 8.6 %Niagara County8.6Erie County: 8.5 %Erie County8.5Richmond County: 8.4 %Richmond County8.4Chautauqua County: 8.2 %Chautauqua County8.2Jefferson County: 7.8 %Jefferson County7.8Oswego County: 7.8 %Oswego County7.8Putnam County: 7.7 %Putnam County7.7Orange County: 7.2 %Orange County7.2Suffolk County: 7.1 %Suffolk County7.1Westchester County: 6.3 %Westchester County6.3Bronx County: 5.5 %Bronx County5.5Essex County: 5.2 %Essex County5.2Queens County: 4.9 %Queens County4.9Rensselaer County: 4.5 %Rensselaer County4.5Saratoga County: 4.4 %Saratoga County4.4Onondaga County: 4.1 %Onondaga County4.1Franklin County: 3.9 %Franklin County3.9Albany County: 3.6 %Albany County3.6Monroe County: 3.6 %Monroe County3.6Tompkins County: 3.3 %Tompkins County3.3Ulster County: 3.1 %Ulster County3.1Madison County: 2.7 %Madison County2.7Hamilton County: 2 %Hamilton County2Schenectady County: 1.9 %Schenectady County1.9Dutchess County: 1.7 %Dutchess County1.7New York County: 1.6 %New York County1.6Oneida County: 1.4 %Oneida County1.4Chemung County: 0.9 %Chemung County0.9Kings County: 0.8 %Kings County0.8Herkimer County: 0.6 %Herkimer County0.6Nassau County: 0.6 %Nassau County0.6Steuben County: 0.6 %Steuben County0.6Wayne County: 0.5 %Wayne County0.5St. Lawrence County: 0 %St. Lawrence County0
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties2005 (%)Change on 2004
1Niagara County8.6+5.9 pts
2Erie County8.5+4.1 pts
3Richmond County8.4+3.1 pts
4Chautauqua County8.2+3.8 pts
5Jefferson County7.8+5.9 pts
5Oswego County7.8+5.2 pts
7Putnam County7.7+4.1 pts
8Orange County7.2+3.8 pts
9Suffolk County7.1+2.7 pts
10Westchester County6.3+4 pts
11Bronx County5.5+2.8 pts
12Essex County5.2+2.2 pts
13Queens County4.9+2.2 pts
14Rensselaer County4.5+0.8 pts
15Saratoga County4.4+1.9 pts
16Onondaga County4.1+3.8 pts
17Franklin County3.9+3.9 pts
18Albany County3.6+2.2 pts
18Monroe County3.6+3 pts
20Tompkins County3.3+2.7 pts
21Ulster County3.1+0.9 pts
22Madison County2.7+1.8 pts
23Hamilton County2+1.4 pts
24Schenectady County1.9+1.1 pts
25Dutchess County1.7+0.6 pts
26New York County1.6+0.2 pts
27Oneida County1.4+0.1 pts
28Chemung County0.9+0.3 pts
29Kings County0.80 pts
30Herkimer County0.6+0.3 pts
30Nassau County0.6-0.1 pts
30Steuben County0.6-0.6 pts
33Wayne County0.5-0.4 pts
34St. Lawrence County0-0.9 pts

Other periods

About this ranking

Days with a daily Air Quality Index above 100 (unhealthy for sensitive groups, unhealthy, very unhealthy or hazardous) 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; the counts are stored with each value.

Use the share rather than the number of days to compare counties, since the days with an AQI differ. 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 2005 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: days with an AQI above 100 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: days with an AQI above 100 as a share of days with an AQI, calculated with stored counts (Counties in New York by share of days unhealthy for sensitive groups or worse (US EPA AQI), 2005) [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: days with an AQI above 100 as a share of days with an AQI, calculated with stored counts, Counties in New York by share of days unhealthy for sensitive groups or worse (US EPA AQI), 2005. U.S. Environmental Protection Agency, 13 July 2026, https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Invokely, https://invokely.ai/rankings/unhealthy-air-quality-days-share/new-york-counties?period=2005. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Environmental Protection Agency. 2026. EPA AirData annual AQI by county: days with an AQI above 100 as a share of days with an AQI, calculated with stored counts. Counties in New York by share of days unhealthy for sensitive groups or worse (US EPA AQI), 2005. Dataset. Accessed October 12, 2026. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Also distributed by Invokely, https://invokely.ai/rankings/unhealthy-air-quality-days-share/new-york-counties?period=2005.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: days with an AQI above 100 as a share of days with an AQI, calculated with stored counts, Counties in New York by share of days unhealthy for sensitive groups or worse (US EPA AQI), 2005 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/rankings/unhealthy-air-quality-days-share/new-york-counties?period=2005 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_new_york_2005,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: days with an AQI above 100 as a share of days with an AQI, calculated with stored counts: Counties in New York by share of days unhealthy for sensitive groups or worse (US EPA AQI), 2005}},
  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/unhealthy-air-quality-days-share/new-york-counties?period=2005. Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: days with an AQI above 100 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: days with an AQI above 100 as a share of days with an AQI, calculated with stored counts: Counties in New York by share of days unhealthy for sensitive groups or worse (US EPA AQI), 2005
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/unhealthy-air-quality-days-share/new-york-counties?period=2005
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/unhealthy-air-quality-days-share/new-york-counties?period=2005.
N1  - Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: days with an AQI above 100 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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Rank Counties in New York by share of days unhealthy for sensitive groups or worse (US EPA AQI) using official data, and cite the source.
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Questions

Which county has the highest share of days unhealthy for sensitive groups or worse (US EPA AQI)?

Niagara County, with 8.6% in 2005, according to EPA.

Which county has the lowest share of days unhealthy for sensitive groups or worse (US EPA AQI)?

St. Lawrence County, with 0% in 2005.

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: days with an AQI above 100 as a share of days with an AQI, calculated with stored counts. Retrieved 2026-10-12. 5 counties have no value for 2005 and are not ranked.

Share of days unhealthy for sensitive groups or worse (US EPA AQI): other rankings

Counties in New York: more rankings