Air Quality Rankings for New Jersey 2026

New Jersey has 16 cities with EPA air quality data. Morris, New Jersey has the cleanest air with a 5-year average AQI of 36. Union, New Jersey has the highest AQI at 51.

#	City	5yr Avg AQI	Current AQI	Worst Pollutant	Trend	Grade
1	Morris, New Jersey	36	37	Ozone	Stable	B
2	Monmouth, New Jersey	37	39	Ozone	Stable	B
3	Atlantic, New Jersey	38	38	Ozone	Improving	B
4	Passaic, New Jersey	39	42	Ozone	Stable	B
5	Gloucester, New Jersey	40	43	Ozone	Stable	B
6	Ocean, New Jersey	40	42	PM2.5	Stable	C
7	Warren, New Jersey	41	41	PM2.5	Stable	C
8	Cumberland, New Jersey	42	43	Ozone	Worsening	C
9	Hunterdon, New Jersey	43	44	Ozone	Stable	C
10	Middlesex, New Jersey	43	44	PM2.5	Worsening	C
11	Hudson, New Jersey	44	44	PM2.5	Improving	B
12	Essex, New Jersey	45	44	PM2.5	Worsening	C
13	Bergen, New Jersey	46	48	PM2.5	Stable	C
14	Mercer, New Jersey	46	49	PM2.5	Stable	C
15	Camden, New Jersey	49	50	PM2.5	Improving	C
16	Union, New Jersey	51	52	PM2.5	Improving	C

Air quality data for New Jersey is sourced from the EPA Air Quality System (AQS), which monitors outdoor air quality at thousands of stations nationwide.
— EPA Air Quality System

Frequently Asked Questions

Morris, New Jersey has the best air quality in New Jersey with a 5-year average AQI of 36 and a grade of B.

New Jersey has 16 cities with EPA air quality monitoring data in our database, covering multiple years of AQI measurements.

The Air Quality Index (AQI) measures five major pollutants: ground-level ozone, particulate matter (PM2.5 and PM10), carbon monoxide, sulfur dioxide, and nitrogen dioxide. Lower AQI values indicate cleaner air — 0-50 is "Good," while 150+ is "Unhealthy."

Sources: EPA Air Quality System (AQS)

Cities ranked by 5-year average AQI (lower is better). Grades factor in average AQI, trend direction, unhealthy days, and dominant pollutant.

Cleanest Cities Nationwide →All Air Quality in New Jersey →