Counties in New Jersey by share of days with good air quality (US EPA AQI)

Salem County had the highest share of days with good air quality (US EPA AQI) of 19 counties in 1982, at 98.9%. Union County had the lowest, at 26.3%. The median was 62.9%. Source: EPA.

Highest98.9Salem County

Lowest26.3Union County

Median62.919 counties

Map of counties, 1982

Under 46
46 to 61
61 to 67
67 to 80
80 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

%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

Rank	Counties	1982 (%)	Change on 1981
1	Salem County	98.9	+5.5 pts
2	Warren County	96.9	+36.9 pts
3	Ocean County	91	+4.3 pts
4	Passaic County	83	-11.3 pts
5	Monmouth County	78.1	+9.1 pts
6	Mercer County	74.6	-7 pts
7	Somerset County	73.5	-1.6 pts
8	Hunterdon County	67.5	-3.1 pts
9	Cape May County	66.7	-1.1 pts
10	Atlantic County	62.9	+9.2 pts
11	Burlington County	62	-7 pts
12	Gloucester County	60.2	-39.8 pts
13	Bergen County	55.2	-4.3 pts
14	Middlesex County	54	-10.7 pts
15	Camden County	49	-3.3 pts
16	Essex County	41.4	-3.8 pts
17	Morris County	40.7	+12.2 pts
18	Hudson County	26.3	-8.8 pts
18	Union County	26.3	-33.8 pts

Other periods

1983
1982
1981
1980

About this ranking

Days with a daily Air Quality Index of 0 to 50 (good) 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; both counts are stored with each value.

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: good days 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: good days as a share of days with an AQI, calculated with stored counts (Counties in New Jersey by share of days with good air quality (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: good days as a share of days with an AQI, calculated with stored counts, Counties in New Jersey by share of days with good air quality (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/good-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: good days as a share of days with an AQI, calculated with stored counts. Counties in New Jersey by share of days with good air quality (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/good-air-quality-days-share/new-jersey-counties?period=1982.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts, Counties in New Jersey by share of days with good air quality (US EPA AQI), 1982 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/rankings/good-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: good days as a share of days with an AQI, calculated with stored counts: Counties in New Jersey by share of days with good air quality (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/good-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: good days 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: good days as a share of days with an AQI, calculated with stored counts: Counties in New Jersey by share of days with good air quality (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/good-air-quality-days-share/new-jersey-counties?period=1982
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-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: good days 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 with good air quality (US EPA AQI) using official data, and cite the source.

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Questions

Which county has the highest share of days with good air quality (US EPA AQI)?

Salem County, with 98.9% in 1982, according to EPA.

Which county has the lowest share of days with good air quality (US EPA AQI)?

Union County, with 26.3% 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: good days 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.