Data / Share of days with good air quality (US EPA AQI) / Ulster County

Share of days with good air quality (US EPA AQI) in Ulster County

Share of days with good air quality (US EPA AQI) in Ulster County was 89% in 2012, according to EPA. That is down 2.7 pts from 2011. That is the 11th highest of 33 counties in 2012.

201289%
Change on 2011-2.7 pts
Rank11th of 33Counties in New York ranked
Series high1001990
Series low74.81991

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Share of days with good air quality (US EPA AQI) in Ulster County, 1989 to 2012

70809010019891993199720012005200920121989: 96.7 %1990: 100 %1991: 74.8 %1992: 85.5 %1993: 76 %1994: 77.1 %1995: 84.1 %1996: 84.1 %1997: 83.3 %1998: 78.9 %1999: 77.1 %2000: 86.7 %2001: 81.9 %2002: 80.6 %2003: 83.7 %2004: 87.6 %2005: 85.1 %2006: 88.3 %2007: 87.5 %2008: 92.4 %2009: 92.8 %2010: 87.3 %2011: 91.7 %2012: 89 %70809010019891997200520121989: 96.7 %1990: 100 %1991: 74.8 %1992: 85.5 %1993: 76 %1994: 77.1 %1995: 84.1 %1996: 84.1 %1997: 83.3 %1998: 78.9 %1999: 77.1 %2000: 86.7 %2001: 81.9 %2002: 80.6 %2003: 83.7 %2004: 87.6 %2005: 85.1 %2006: 88.3 %2007: 87.5 %2008: 92.4 %2009: 92.8 %2010: 87.3 %2011: 91.7 %2012: 89 %
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12, published 2026-07-13.
All 24 values
Period%
201289
201191.7
201087.3
200992.8
200892.4
200787.5
200688.3
200585.1
200487.6
200383.7
200280.6
200181.9
200086.7
199977.1
199878.9
199783.3
199684.1
199584.1
199477.1
199376
199285.5
199174.8
1990100
198996.7

Ulster County compared with nearby places

Albany County: 71.3 %Bronx County: 41.5 %Chautauqua County: 76.5 %Chemung County: 90.3 %Dutchess County: 91 %Erie County: 42.6 %Essex County: 80.9 %Franklin County: 99.7 %Hamilton County: 88.8 %Herkimer County: 94.7 %Jefferson County: 90.9 %Kings County: 48.5 %Madison County: 100 %Monroe County: 65.3 %Nassau County: 53.9 %New York County: 38 %Niagara County: 49.9 %Oneida County: 66.7 %Onondaga County: 85.5 %Orange County: 69.7 %Oswego County: 90.5 %Putnam County: 93 %Queens County: 51.9 %Rensselaer County: 93.4 %Richmond County: 49.3 %Rockland County: 68.6 %Saratoga County: 93.4 %Steuben County: 86.9 %Suffolk County: 63.8 %Tompkins County: 87.1 %Ulster County: 89 %Wayne County: 86 %Westchester County: 66.7 %
  • Under 51
  • 51 to 67
  • 67 to 81
  • 81 to 89
  • 89 to 92
  • 92 and over
  • No data
Share of days with good air quality (US EPA AQI), 2012, %. Ulster County is outlined. Same source and period for every area shown. Source: U.S. Environmental Protection Agency. Boundaries: U.S. Census Bureau cartographic boundary files.

Rankings

Definition

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.

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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 (Share of days with good air quality (US EPA AQI), Ulster County, 1989 to 2012) [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, Share of days with good air quality (US EPA AQI), Ulster County, 1989 to 2012. U.S. Environmental Protection Agency, 13 July 2026, https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Invokely, https://invokely.ai/en/good-air-quality-days-share/ulster-county-new-york. 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. Share of days with good air quality (US EPA AQI), Ulster County, 1989 to 2012. Dataset. Accessed October 12, 2026. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Also distributed by Invokely, https://invokely.ai/en/good-air-quality-days-share/ulster-county-new-york.

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, Share of days with good air quality (US EPA AQI), Ulster County, 1989 to 2012 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/good-air-quality-days-share/ulster-county-new-york (Accessed: 12 October 2026).

BibTeX
@misc{environmental_share_of_days_with_2012,
  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: Share of days with good air quality (US EPA AQI), Ulster County, 1989 to 2012}},
  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/en/good-air-quality-days-share/ulster-county-new-york. 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: Share of days with good air quality (US EPA AQI), Ulster County, 1989 to 2012
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/en/good-air-quality-days-share/ulster-county-new-york
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/good-air-quality-days-share/ulster-county-new-york.
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

What is the share of days with good air quality (US EPA AQI) in Ulster County?

Share of days with good air quality (US EPA AQI) in Ulster County was 89% in 2012, according to EPA. That is down 2.7 pts from 2011. That is the 11th highest of 33 counties in 2012.

Where does this figure come from?

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 by Invokely on 2026-10-12.

What was the highest share of days with good air quality (US EPA AQI) in Ulster County?

100% in 1990, the highest value since 1989 in this series.

Related statistics for Ulster County

All statistics for Ulster County | Ulster County in figures