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

Median Air Quality Index (US EPA) in Passaic County

Median Air Quality Index (US EPA) in Passaic County was 41 in 2025, according to the U.S. Environmental Protection Agency. That is up 3 from 2024.

2025, index41
Change on 2024+3
Series high481999
Series low131983

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 Passaic County, 1980 to 2025

102030405019801987199420012008201520251980: 39 index1981: 22 index1982: 34 index1983: 13 index1984: 21 index1985: 25 index1986: 33 index1987: 32 index1988: 27 index1989: 27 index1990: 26 index1991: 24 index1992: 21 index1993: 26 index1994: 29 index1995: 25 index1996: 25 index1997: 22 index1998: 34 index1999: 48 index2000: 46 index2001: 47 index2002: 47 index2003: 44 index2004: 43 index2005: 46 index2006: 44 index2007: 44 index2008: 43 index2009: 38 index2010: 42 index2011: 41 index2012: 41 index2013: 38 index2014: 41 index2015: 41 index2016: 41 index2017: 38 index2018: 39 index2019: 40 index2020: 37 index2021: 37 index2022: 38 index2023: 42 index2024: 38 index2025: 41 index102030405019801996201220251980: 39 index1981: 22 index1982: 34 index1983: 13 index1984: 21 index1985: 25 index1986: 33 index1987: 32 index1988: 27 index1989: 27 index1990: 26 index1991: 24 index1992: 21 index1993: 26 index1994: 29 index1995: 25 index1996: 25 index1997: 22 index1998: 34 index1999: 48 index2000: 46 index2001: 47 index2002: 47 index2003: 44 index2004: 43 index2005: 46 index2006: 44 index2007: 44 index2008: 43 index2009: 38 index2010: 42 index2011: 41 index2012: 41 index2013: 38 index2014: 41 index2015: 41 index2016: 41 index2017: 38 index2018: 39 index2019: 40 index2020: 37 index2021: 37 index2022: 38 index2023: 42 index2024: 38 index2025: 41 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
202541
202438
202342
202238
202137
202037
201940
201839
201738
201641
201541
201441
201338
201241
201141
201042
200938
200843
200744
200644
200546
200443
200344
200247
200147
200046
199948
199834
199722
199625
199525
199429
199326
199221
199124
199026
198927
198827
198732
198633
198525
198421
198313
198234
198122
198039

Passaic County compared with nearby places

Atlantic County: 36 indexBergen County: 40 indexCamden County: 44 indexCumberland County: 40 indexGloucester County: 39 indexHudson County: 41 indexHunterdon County: 41 indexMercer County: 43 indexMiddlesex County: 36 indexMonmouth County: 36 indexMorris County: 39 indexOcean County: 39 indexPassaic County: 41 indexUnion County: 44 indexWarren County: 37 index
  • Under 37
  • 37 to 39
  • 39 to 40
  • 40 to 41
  • 41 and over
  • No data
Median Air Quality Index (US EPA), 2025, index. Passaic 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), Passaic 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), Passaic 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/passaic-county-new-jersey. 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), Passaic 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/passaic-county-new-jersey.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: median daily AQI, Median Air Quality Index (US EPA), Passaic 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/passaic-county-new-jersey (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), Passaic 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/passaic-county-new-jersey. 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), Passaic 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/passaic-county-new-jersey
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/median-air-quality-index/passaic-county-new-jersey.
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 Passaic County?

Median Air Quality Index (US EPA) in Passaic County was 41 in 2025, according to the U.S. Environmental Protection Agency. That is up 3 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 Passaic County?

48 in 1999, the highest value since 1980 in this series.

Related statistics for Passaic County

All statistics for Passaic County | Passaic County in figures