Data / Median Air Quality Index (US EPA) / Madison County

Median Air Quality Index (US EPA) in Madison County

Median Air Quality Index (US EPA) in Madison County was 33 in 2012, according to the U.S. Environmental Protection Agency. That is down 2 from 2011. That is the 25th highest of 33 counties in 2012.

2012, index33
Change on 2011-2
Rank25th of 33Counties in New York ranked
Series high391991
Series low311990

Next release: Tuesday, 13 July 2027, estimated by Invokely from past publication dates (low confidence), not announced by the publisher. Release calendar

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Median Air Quality Index (US EPA) in Madison County, 1990 to 2012

3032343638401990199419982002200620121990: 31 index1991: 39 index1992: 34 index1993: 36 index1994: 36 index1995: 36 index1996: 36 index1997: 36 index1998: 35 index1999: 39 index2000: 35 index2001: 39 index2002: 37 index2003: 37 index2004: 33 index2005: 38 index2006: 35 index2007: 37 index2008: 34 index2009: 34 index2010: 36 index2011: 35 index2012: 33 index30323436384019901998200620121990: 31 index1991: 39 index1992: 34 index1993: 36 index1994: 36 index1995: 36 index1996: 36 index1997: 36 index1998: 35 index1999: 39 index2000: 35 index2001: 39 index2002: 37 index2003: 37 index2004: 33 index2005: 38 index2006: 35 index2007: 37 index2008: 34 index2009: 34 index2010: 36 index2011: 35 index2012: 33 index
index. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 23 values
Periodindex
201233
201135
201036
200934
200834
200737
200635
200538
200433
200337
200237
200139
200035
199939
199835
199736
199636
199536
199436
199336
199234
199139
199031

Madison County compared with nearby places

Albany County: 42 indexBronx County: 53 indexChautauqua County: 40 indexChemung County: 33 indexDutchess County: 32 indexErie County: 52 indexEssex County: 41 indexFranklin County: 12 indexHamilton County: 34 indexHerkimer County: 33 indexJefferson County: 32 indexKings County: 51 indexMadison County: 33 indexMonroe County: 44 indexNassau County: 46 indexNew York County: 54 indexNiagara County: 51 indexOneida County: 42 indexOnondaga County: 35 indexOrange County: 42 indexOswego County: 34 indexPutnam County: 29 indexQueens County: 50 indexRensselaer County: 34 indexRichmond County: 51 indexRockland County: 42 indexSaratoga County: 31 indexSteuben County: 35 indexSuffolk County: 44 indexTompkins County: 37 indexUlster County: 36 indexWayne County: 33 indexWestchester County: 43 index
  • Under 33
  • 33 to 34
  • 34 to 40
  • 40 to 42
  • 42 to 51
  • 51 and over
  • No data
Median Air Quality Index (US EPA), 2012, index. Madison 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

Median of the daily Air Quality Index (AQI) values of a US county over the days of the year with an AQI, from the EPA AirData annual summaries.

More on how it is measured
  • The daily county AQI is the highest AQI among the monitors and pollutants reported that day (ozone, PM2.5, PM10, carbon monoxide and nitrogen dioxide).
  • Lower is cleaner: 0 to 50 is good, 51 to 100 moderate and above 100 unhealthy for sensitive groups.

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: median daily AQI. 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: median daily AQI (Median Air Quality Index (US EPA), Madison County, 1990 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: median daily AQI, Median Air Quality Index (US EPA), Madison County, 1990 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/median-air-quality-index/madison-county-new-york. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Environmental Protection Agency. 2026. EPA AirData annual AQI by county: median daily AQI. Median Air Quality Index (US EPA), Madison County, 1990 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/median-air-quality-index/madison-county-new-york.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: median daily AQI, Median Air Quality Index (US EPA), Madison County, 1990 to 2012 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/median-air-quality-index/madison-county-new-york (Accessed: 12 October 2026).

BibTeX
@misc{environmental_median_air_quality_index_2012,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: median daily AQI: Median Air Quality Index (US EPA), Madison County, 1990 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/median-air-quality-index/madison-county-new-york. Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: median daily AQI. 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: median daily AQI: Median Air Quality Index (US EPA), Madison County, 1990 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/median-air-quality-index/madison-county-new-york
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/median-air-quality-index/madison-county-new-york.
N1  - Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: median daily AQI. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Retrieved 2026-10-12.
ER  -
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Questions

What is the median Air Quality Index (US EPA) in Madison County?

Median Air Quality Index (US EPA) in Madison County was 33 in 2012, according to the U.S. Environmental Protection Agency. That is down 2 from 2011. That is the 25th highest of 33 counties in 2012.

Where does this figure come from?

U.S. Environmental Protection Agency. EPA AirData annual AQI by county: median daily AQI. Retrieved by Invokely on 2026-10-12.

What was the highest median Air Quality Index (US EPA) in Madison County?

39 in 1991, the highest value since 1990 in this series.

Related statistics for Madison County

All statistics for Madison County | Madison County in figures