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), 1983

Union County had the highest share of days unhealthy for sensitive groups or worse (US EPA AQI) of 18 counties in 1983, at 25%. Somerset County had the lowest, at 0%. The median was 17.5%. Source: EPA.

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Highest25Union County
Lowest0Somerset County
Median17.518 counties

Map of counties, 1983

Atlantic County: 19.5 %Bergen County: 15.5 %Burlington County: 17.6 %Camden County: 24.2 %Cumberland County: 17.2 %Essex County: 23.5 %Gloucester County: 24.3 %Hudson County: 20.1 %Hunterdon County: 18.2 %Mercer County: 17.4 %Middlesex County: 16.8 %Monmouth County: 0 %Morris County: 18.4 %Ocean County: 0 %Passaic County: 0 %Salem County: 0 %Somerset County: 0 %Union County: 25 %
  • Under 17
  • 17 to 18
  • 18 to 22
  • 22 and over
  • No data
%, 1983. 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, 1983

Union County: 25 %Union County25Gloucester County: 24.3 %Gloucester County24.3Camden County: 24.2 %Camden County24.2Essex County: 23.5 %Essex County23.5Hudson County: 20.1 %Hudson County20.1Atlantic County: 19.5 %Atlantic County19.5Morris County: 18.4 %Morris County18.4Hunterdon County: 18.2 %Hunterdon County18.2Burlington County: 17.6 %Burlington County17.6Mercer County: 17.4 %Mercer County17.4Cumberland County: 17.2 %Cumberland County17.2Middlesex County: 16.8 %Middlesex County16.8Bergen County: 15.5 %Bergen County15.5Monmouth County: 0 %Monmouth County0Ocean County: 0 %Ocean County0Passaic County: 0 %Passaic County0Salem County: 0 %Salem County0Somerset County: 0 %Somerset County0Union County: 25 %Union County25Gloucester County: 24.3 %Gloucester County24.3Camden County: 24.2 %Camden County24.2Essex County: 23.5 %Essex County23.5Hudson County: 20.1 %Hudson County20.1Atlantic County: 19.5 %Atlantic County19.5Morris County: 18.4 %Morris County18.4Hunterdon County: 18.2 %Hunterdon County18.2Burlington County: 17.6 %Burlington County17.6Mercer County: 17.4 %Mercer County17.4Cumberland County: 17.2 %Cumberland County17.2Middlesex County: 16.8 %Middlesex County16.8Bergen County: 15.5 %Bergen County15.5Monmouth County: 0 %Monmouth County0Ocean County: 0 %Ocean County0Passaic County: 0 %Passaic County0Salem County: 0 %Salem County0Somerset County: 0 %Somerset County0
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties1983 (%)Change on 1982
1Union County25+6.2 pts
2Gloucester County24.3+3 pts
3Camden County24.2+8.1 pts
4Essex County23.5+11.3 pts
5Hudson County20.1+3.8 pts
6Atlantic County19.5+3.1 pts
7Morris County18.4+5.7 pts
8Hunterdon County18.2+3 pts
9Burlington County17.6+4.9 pts
10Mercer County17.4+4 pts
11Cumberland County17.2n/a
12Middlesex County16.8+3.8 pts
13Bergen County15.5+3.5 pts
14Monmouth County0-0.6 pts
14Ocean County00 pts
14Passaic County0-2.1 pts
14Salem County00 pts
14Somerset County0-3.1 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. 2 counties with data in other periods have no value for 1983 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), 1983) [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), 1983. 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. 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), 1983. 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.

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), 1983 [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 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_new_jersey_1983,
  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), 1983}},
  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. 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), 1983
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
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/unhealthy-air-quality-days-share/new-jersey-counties.
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.
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Questions

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

Union County, with 25% in 1983, according to EPA.

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

Somerset County, with 0% in 1983.

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. 2 counties have no value for 1983 and are not ranked.

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

Counties in New Jersey: more rankings