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)

Morris County had the highest share of days unhealthy for sensitive groups or worse (US EPA AQI) of 19 counties in 1981, at 19.1%. Warren County had the lowest, at 0%. The median was 9.9%. Source: EPA.

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Highest19.1Morris County
Lowest0Warren County
Median9.919 counties

Map of counties, 1981

Atlantic County: 15.9 %Bergen County: 7.4 %Burlington County: 9.9 %Camden County: 17 %Cape May County: 18.2 %Essex County: 12.4 %Gloucester County: 0 %Hudson County: 10.4 %Hunterdon County: 15.4 %Mercer County: 11.2 %Middlesex County: 7.1 %Monmouth County: 0.5 %Morris County: 19.1 %Ocean County: 0 %Passaic County: 0 %Salem County: 0 %Somerset County: 4.3 %Union County: 11.5 %Warren County: 0 %
  • Under 7.2
  • 7.2 to 11
  • 11 to 16
  • 16 and over
  • No data
%, 1981. 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, 1981

Morris County: 19.1 %Morris County19.1Cape May County: 18.2 %Cape May County18.2Camden County: 17 %Camden County17Atlantic County: 15.9 %Atlantic County15.9Hunterdon County: 15.4 %Hunterdon County15.4Essex County: 12.4 %Essex County12.4Union County: 11.5 %Union County11.5Mercer County: 11.2 %Mercer County11.2Hudson County: 10.4 %Hudson County10.4Burlington County: 9.9 %Burlington County9.9Bergen County: 7.4 %Bergen County7.4Middlesex County: 7.1 %Middlesex County7.1Somerset County: 4.3 %Somerset County4.3Monmouth County: 0.5 %Monmouth County0.5Gloucester County: 0 %Gloucester County0Ocean County: 0 %Ocean County0Passaic County: 0 %Passaic County0Salem County: 0 %Salem County0Warren County: 0 %Warren County0Morris County: 19.1 %Morris County19.1Cape May County: 18.2 %Cape May County18.2Camden County: 17 %Camden County17Atlantic County: 15.9 %Atlantic County15.9Hunterdon County: 15.4 %Hunterdon County15.4Essex County: 12.4 %Essex County12.4Union County: 11.5 %Union County11.5Mercer County: 11.2 %Mercer County11.2Hudson County: 10.4 %Hudson County10.4Burlington County: 9.9 %Burlington County9.9Bergen County: 7.4 %Bergen County7.4Middlesex County: 7.1 %Middlesex County7.1Somerset County: 4.3 %Somerset County4.3Monmouth County: 0.5 %Monmouth County0.5Gloucester County: 0 %Gloucester County0Ocean County: 0 %Ocean County0Passaic County: 0 %Passaic County0Salem County: 0 %Salem County0Warren County: 0 %Warren County0
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties1981 (%)Change on 1980
1Morris County19.1+0.1 pts
2Cape May County18.2-5.5 pts
3Camden County17-6.5 pts
4Atlantic County15.9-4.2 pts
5Hunterdon County15.4-16.7 pts
6Essex County12.4-2.7 pts
7Union County11.5-7.9 pts
8Mercer County11.2-8.9 pts
9Hudson County10.4-3 pts
10Burlington County9.9-13.5 pts
11Bergen County7.4-6.8 pts
12Middlesex County7.1-6.9 pts
13Somerset County4.3-2.5 pts
14Monmouth County0.5-12.3 pts
15Gloucester County00 pts
15Ocean County0-0.3 pts
15Passaic County0-0.6 pts
15Salem County00 pts
15Warren County0-0.6 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 1981 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), 1981) [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), 1981. 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=1981. 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), 1981. 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=1981.

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), 1981 [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=1981 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_new_jersey_1981,
  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), 1981}},
  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=1981. 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), 1981
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=1981
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/unhealthy-air-quality-days-share/new-jersey-counties?period=1981.
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)?

Morris County, with 19.1% in 1981, 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 1981.

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 1981 and are not ranked.

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

Counties in New Jersey: more rankings