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

Median Air Quality Index (US EPA) in Niagara County

Median Air Quality Index (US EPA) in Niagara County was 34 in 2025, according to the U.S. Environmental Protection Agency. That is unchanged from 2024.

2025, index34
Change on 20240
Series high532008
Series low271980

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 Niagara County, 1980 to 2025

203040506019801987199420012008201520251980: 27 index1981: 31 index1982: 35 index1983: 31 index1984: 32 index1985: 35 index1986: 34 index1987: 35 index1988: 33 index1989: 33 index1990: 32 index1991: 33 index1992: 32 index1993: 33 index1994: 33 index1995: 33 index1996: 34 index1997: 32 index1998: 35 index1999: 40 index2000: 37 index2001: 41 index2002: 40 index2003: 36 index2004: 34 index2005: 39 index2006: 31 index2007: 52 index2008: 53 index2009: 48 index2010: 47 index2011: 51 index2012: 51 index2013: 36 index2014: 35 index2015: 36 index2016: 39 index2017: 35 index2018: 34 index2019: 35 index2020: 34 index2021: 34 index2022: 35 index2023: 33 index2024: 34 index2025: 34 index203040506019801996201220251980: 27 index1981: 31 index1982: 35 index1983: 31 index1984: 32 index1985: 35 index1986: 34 index1987: 35 index1988: 33 index1989: 33 index1990: 32 index1991: 33 index1992: 32 index1993: 33 index1994: 33 index1995: 33 index1996: 34 index1997: 32 index1998: 35 index1999: 40 index2000: 37 index2001: 41 index2002: 40 index2003: 36 index2004: 34 index2005: 39 index2006: 31 index2007: 52 index2008: 53 index2009: 48 index2010: 47 index2011: 51 index2012: 51 index2013: 36 index2014: 35 index2015: 36 index2016: 39 index2017: 35 index2018: 34 index2019: 35 index2020: 34 index2021: 34 index2022: 35 index2023: 33 index2024: 34 index2025: 34 index
index. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 46 values
Periodindex
202534
202434
202333
202235
202134
202034
201935
201834
201735
201639
201536
201435
201336
201251
201151
201047
200948
200853
200752
200631
200539
200434
200336
200240
200141
200037
199940
199835
199732
199634
199533
199433
199333
199232
199133
199032
198933
198833
198735
198634
198535
198432
198331
198235
198131
198027

Niagara County compared with nearby places

Albany County: 39 indexBronx County: 45 indexChautauqua County: 36 indexDutchess County: 34 indexErie County: 44 indexEssex County: 41 indexHamilton County: 34 indexJefferson County: 34 indexKings County: 39 indexMonroe County: 39 indexNassau County: 29 indexNew York County: 50 indexNiagara County: 34 indexOneida County: 27 indexOnondaga County: 36 indexOrange County: 27 indexOswego County: 34 indexPutnam County: 33 indexQueens County: 44 indexRichmond County: 41 indexRockland County: 37 indexSaratoga County: 34 indexSteuben County: 38 indexSuffolk County: 41 indexTompkins County: 35 indexWayne County: 33 indexWestchester County: 38 index
  • Under 34
  • 34 to 38
  • 38 to 41
  • 41 and over
  • No data
Median Air Quality Index (US EPA), 2025, index. Niagara 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), Niagara County, 1980 to 2025) [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), Niagara County, 1980 to 2025. 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/niagara-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), Niagara County, 1980 to 2025. 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/niagara-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), Niagara County, 1980 to 2025 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/median-air-quality-index/niagara-county-new-york (Accessed: 12 October 2026).

BibTeX
@misc{environmental_median_air_quality_index_2025,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: median daily AQI: Median Air Quality Index (US EPA), Niagara County, 1980 to 2025}},
  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/niagara-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), Niagara County, 1980 to 2025
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/niagara-county-new-york
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/median-air-quality-index/niagara-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 Niagara County?

Median Air Quality Index (US EPA) in Niagara County was 34 in 2025, according to the U.S. Environmental Protection Agency. That is unchanged from 2024.

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 Niagara County?

53 in 2008, the highest value since 1980 in this series.

Related statistics for Niagara County

All statistics for Niagara County | Niagara County in figures