Data / Share of days unhealthy for sensitive groups or worse (US EPA AQI) / Passaic County

Share of days unhealthy for sensitive groups or worse (US EPA AQI) in Passaic County

Share of days unhealthy for sensitive groups or worse (US EPA AQI) in Passaic County was 1.1% in 2025, according to EPA. That is up 0.6 pts from 2024.

20251.1%
Change on 2024+0.6 pts
Series high122002
Series low01981

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Share of days unhealthy for sensitive groups or worse (US EPA AQI) in Passaic County, 1980 to 2025

02.557.51012.519801987199420012008201520251980: 0.6 %1981: 0 %1982: 2.1 %1983: 0 %1984: 0 %1985: 0 %1986: 0 %1987: 0 %1988: 0 %1989: 0 %1990: 0 %1991: 0 %1992: 0 %1993: 0 %1994: 0 %1995: 0 %1996: 0 %1997: 0 %1998: 10.9 %1999: 11.2 %2000: 6.4 %2001: 8.6 %2002: 12 %2003: 5.5 %2004: 3.9 %2005: 8.7 %2006: 4.1 %2007: 8 %2008: 3.2 %2009: 0.7 %2010: 3.5 %2011: 2.4 %2012: 2 %2013: 0.7 %2014: 0 %2015: 2.5 %2016: 1.9 %2017: 0.3 %2018: 1.1 %2019: 0.4 %2020: 0 %2021: 0 %2022: 0 %2023: 2.3 %2024: 0.5 %2025: 1.1 %05101519801996201220251980: 0.6 %1981: 0 %1982: 2.1 %1983: 0 %1984: 0 %1985: 0 %1986: 0 %1987: 0 %1988: 0 %1989: 0 %1990: 0 %1991: 0 %1992: 0 %1993: 0 %1994: 0 %1995: 0 %1996: 0 %1997: 0 %1998: 10.9 %1999: 11.2 %2000: 6.4 %2001: 8.6 %2002: 12 %2003: 5.5 %2004: 3.9 %2005: 8.7 %2006: 4.1 %2007: 8 %2008: 3.2 %2009: 0.7 %2010: 3.5 %2011: 2.4 %2012: 2 %2013: 0.7 %2014: 0 %2015: 2.5 %2016: 1.9 %2017: 0.3 %2018: 1.1 %2019: 0.4 %2020: 0 %2021: 0 %2022: 0 %2023: 2.3 %2024: 0.5 %2025: 1.1 %
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12, published 2026-07-13.
All 46 values
Period%
20251.1
20240.5
20232.3
20220
20210
20200
20190.4
20181.1
20170.3
20161.9
20152.5
20140
20130.7
20122
20112.4
20103.5
20090.7
20083.2
20078
20064.1
20058.7
20043.9
20035.5
200212
20018.6
20006.4
199911.2
199810.9
19970
19960
19950
19940
19930
19920
19910
19900
19890
19880
19870
19860
19850
19840
19830
19822.1
19810
19800.6

Passaic County compared with nearby places

Atlantic County: 0.3 %Bergen County: 1.1 %Camden County: 0.6 %Cumberland County: 0.8 %Gloucester County: 0.8 %Hudson County: 0.8 %Hunterdon County: 0.8 %Mercer County: 1.6 %Middlesex County: 0.3 %Monmouth County: 2.3 %Morris County: 0.9 %Ocean County: 0.3 %Passaic County: 1.1 %Union County: 0.3 %Warren County: 0.3 %
  • Under 0.7
  • 0.7 to 0.8
  • 0.8 to 1.1
  • 1.1 and over
  • No data
Share of days unhealthy for sensitive groups or worse (US EPA AQI), 2025, %. 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

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.

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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 (Share of days unhealthy for sensitive groups or worse (US EPA AQI), 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: days with an AQI above 100 as a share of days with an AQI, calculated with stored counts, Share of days unhealthy for sensitive groups or worse (US EPA AQI), 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/unhealthy-air-quality-days-share/passaic-county-new-jersey. 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. Share of days unhealthy for sensitive groups or worse (US EPA AQI), 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/unhealthy-air-quality-days-share/passaic-county-new-jersey.

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, Share of days unhealthy for sensitive groups or worse (US EPA AQI), Passaic County, 1980 to 2025 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/unhealthy-air-quality-days-share/passaic-county-new-jersey (Accessed: 12 October 2026).

BibTeX
@misc{environmental_share_of_days_unhealthy_2025,
  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: Share of days unhealthy for sensitive groups or worse (US EPA AQI), 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/unhealthy-air-quality-days-share/passaic-county-new-jersey. 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: Share of days unhealthy for sensitive groups or worse (US EPA AQI), 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/unhealthy-air-quality-days-share/passaic-county-new-jersey
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/unhealthy-air-quality-days-share/passaic-county-new-jersey.
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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Questions

What is the share of days unhealthy for sensitive groups or worse (US EPA AQI) in Passaic County?

Share of days unhealthy for sensitive groups or worse (US EPA AQI) in Passaic County was 1.1% in 2025, according to EPA. That is up 0.6 pts from 2024.

Where does this figure come from?

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 by Invokely on 2026-10-12.

What was the highest share of days unhealthy for sensitive groups or worse (US EPA AQI) in Passaic County?

12% in 2002, the highest value since 1980 in this series.

Related statistics for Passaic County

All statistics for Passaic County | Passaic County in figures