Data / Rankings / Share of days unhealthy for sensitive groups or worse (US EPA AQI) / Counties in New Jersey

Counties in New Jersey by share of days unhealthy for sensitive groups or worse (US EPA AQI)

Gloucester County had the highest share of days unhealthy for sensitive groups or worse (US EPA AQI) of 19 counties in 1982, at 21.3%. Warren County had the lowest, at 0%. The median was 12.7%. Source: EPA.

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Highest21.3Gloucester County
Lowest0Warren County
Median12.719 counties

Map of counties, 1982

Atlantic County: 16.4 %Bergen County: 12 %Burlington County: 12.7 %Camden County: 16.1 %Cape May County: 14.1 %Essex County: 12.2 %Gloucester County: 21.3 %Hudson County: 16.3 %Hunterdon County: 15.2 %Mercer County: 13.4 %Middlesex County: 13 %Monmouth County: 0.6 %Morris County: 12.7 %Ocean County: 0 %Passaic County: 2.1 %Salem County: 0 %Somerset County: 3.1 %Union County: 18.8 %Warren County: 0 %
  • Under 1.5
  • 1.5 to 12
  • 12 to 13
  • 13 to 16
  • 16 and over
  • No data
%, 1982. Hatched areas have no value for this period. Source: Invokely calculation with data from EPA. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 1982

Gloucester County: 21.3 %Gloucester County21.3Union County: 18.8 %Union County18.8Atlantic County: 16.4 %Atlantic County16.4Hudson County: 16.3 %Hudson County16.3Camden County: 16.1 %Camden County16.1Hunterdon County: 15.2 %Hunterdon County15.2Cape May County: 14.1 %Cape May County14.1Mercer County: 13.4 %Mercer County13.4Middlesex County: 13 %Middlesex County13Burlington County: 12.7 %Burlington County12.7Morris County: 12.7 %Morris County12.7Essex County: 12.2 %Essex County12.2Bergen County: 12 %Bergen County12Somerset County: 3.1 %Somerset County3.1Passaic County: 2.1 %Passaic County2.1Monmouth County: 0.6 %Monmouth County0.6Ocean County: 0 %Ocean County0Salem County: 0 %Salem County0Warren County: 0 %Warren County0Gloucester County: 21.3 %Gloucester County21.3Union County: 18.8 %Union County18.8Atlantic County: 16.4 %Atlantic County16.4Hudson County: 16.3 %Hudson County16.3Camden County: 16.1 %Camden County16.1Hunterdon County: 15.2 %Hunterdon County15.2Cape May County: 14.1 %Cape May County14.1Mercer County: 13.4 %Mercer County13.4Middlesex County: 13 %Middlesex County13Burlington County: 12.7 %Burlington County12.7Morris County: 12.7 %Morris County12.7Essex County: 12.2 %Essex County12.2Bergen County: 12 %Bergen County12Somerset County: 3.1 %Somerset County3.1Passaic County: 2.1 %Passaic County2.1Monmouth County: 0.6 %Monmouth County0.6Ocean County: 0 %Ocean County0Salem County: 0 %Salem County0Warren County: 0 %Warren County0
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties1982 (%)Change on 1981
1Gloucester County21.3+21.3 pts
2Union County18.8+7.3 pts
3Atlantic County16.4+0.5 pts
4Hudson County16.3+5.9 pts
5Camden County16.1-0.9 pts
6Hunterdon County15.2-0.2 pts
7Cape May County14.1-4.1 pts
8Mercer County13.4+2.2 pts
9Middlesex County13+5.9 pts
10Burlington County12.7+2.8 pts
10Morris County12.7-6.4 pts
12Essex County12.2-0.2 pts
13Bergen County12+4.6 pts
14Somerset County3.1-1.2 pts
15Passaic County2.1+2.1 pts
16Monmouth County0.6+0.1 pts
17Ocean County00 pts
17Salem County00 pts
17Warren County00 pts

Other periods

About this ranking

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.

Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. 1 counties with data in other periods have no value for 1982 and are left out rather than filled from another source. Equal values share a rank.

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 (Counties in New Jersey by share of days unhealthy for sensitive groups or worse (US EPA AQI), 1982) [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, Counties in New Jersey by share of days unhealthy for sensitive groups or worse (US EPA AQI), 1982. U.S. Environmental Protection Agency, 13 July 2026, https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Invokely, https://invokely.ai/rankings/unhealthy-air-quality-days-share/new-jersey-counties?period=1982. 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. Counties in New Jersey by share of days unhealthy for sensitive groups or worse (US EPA AQI), 1982. Dataset. Accessed October 12, 2026. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Also distributed by Invokely, https://invokely.ai/rankings/unhealthy-air-quality-days-share/new-jersey-counties?period=1982.

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, Counties in New Jersey by share of days unhealthy for sensitive groups or worse (US EPA AQI), 1982 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/rankings/unhealthy-air-quality-days-share/new-jersey-counties?period=1982 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_new_jersey_1982,
  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: Counties in New Jersey by share of days unhealthy for sensitive groups or worse (US EPA AQI), 1982}},
  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/rankings/unhealthy-air-quality-days-share/new-jersey-counties?period=1982. 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: Counties in New Jersey by share of days unhealthy for sensitive groups or worse (US EPA AQI), 1982
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/rankings/unhealthy-air-quality-days-share/new-jersey-counties?period=1982
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/unhealthy-air-quality-days-share/new-jersey-counties?period=1982.
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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Rank Counties in New Jersey by share of days unhealthy for sensitive groups or worse (US EPA AQI) using official data, and cite the source.
rank_places {"indicator":"aqi_unhealthy_sensitive_or_worse_days_share","level":"province","within":"New Jersey","limit":10}
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Questions

Which county has the highest share of days unhealthy for sensitive groups or worse (US EPA AQI)?

Gloucester County, with 21.3% in 1982, according to EPA.

Which county has the lowest share of days unhealthy for sensitive groups or worse (US EPA AQI)?

Warren County, with 0% in 1982.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: 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 2026-10-12. 1 counties have no value for 1982 and are not ranked.

Share of days unhealthy for sensitive groups or worse (US EPA AQI): other rankings

Counties in New Jersey: more rankings