Median AQI
40
Good
New Jersey · County air quality · 2025
Bergen County, New Jersey
Median AQI 40 (Good). 71.1% of monitored days rated Good, direct from EPA Air Quality System stations.
- 40
- Median AQI
- 71.1%
- Good-air days
- 0
- Unhealthy days
- 33%
- Cleaner than US counties
The verdict
According to EPA Air Quality System monitoring data, Bergen County's air is good on balance, more polluted than the median US county, a median AQI of 40 with 71.1% of 180 monitored days in the Good band, driven mainly by Ozone.
- 40
- median AQI · Good
- 71.1%
- days rated Good
- Ozone
- main pollutant
- 33%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 108.
Data updated July 2026
- Good · 128 d · 71.1%
- Moderate · 51 d · 28.3%
- USG · 1 d · 0.6%
How did Bergen County's air break down in 2025?
Across 180 monitored days, 128 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 108 (USG).
EPA AQS →Air quality data from EPA Air Quality System (2025). 180 days monitored. Median AQI: 40 (Good).
Insights: Bergen County, New Jersey. EPA monitors recorded a median Air Quality Index of 40 across 180 measured days in 2025, earning a Good classification and a Moderate health grade. Of those days, 128 (71%) fell in the Good band (AQI 0–50), 51 (28%) registered Moderate readings, and 1 (1%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 60, while the worst single-day peak hit 108 (USG). Residents averaged about 21.3 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as Ozone (74 days), PM2.5 (67 days), NO2 (37 days), CO (2 days). Across the 2020–2025 trend window, good days shifted by -100 and the median AQI moved -3 points, placing the multi-year trajectory at improving. The worst single reading over the 2020–2025 window was AQI 108, usg but never Unhealthy. Nearby counties show comparable readings: Atlantic (79.6% good, AQI 38); Camden (69.4% good, AQI 44); Cumberland (73.0% good, AQI 42); Gloucester (72.4% good, AQI 43); Hudson (74.7% good, AQI 41); Hunterdon (73.6% good, AQI 41).
Air Quality Summary
Good Days
71.1%
128 of 180 monitored days
-3.9pp vs 75% target
Max AQI Recorded
108
USG
Health Grade
Moderate
90th-pct AQI 60
Bergen County, Good days share 71.1%
National avg
Share of monitored days at AQI 0-50 (Good band).
Bergen County, Unhealthy-or-worse share 0.0%
National avg
Share of monitored days above AQI 150 (Unhealthy or worse). Bar maxes at 10% (worst-county ceiling).
AQI Day Breakdown (2025)
Distribution of 180 monitored days across EPA AQI categories.
Good
128
71%
Moderate
51
28%
USG
1
1%
Unhealthy
0
0%
Very Unhealthy
0
0%
Hazardous
0
0%
Pollutant Breakdown
Days where each pollutant was the primary driver of AQI readings in Bergen County.
- Ozone · 74 days · 41.1%
- PM2.5 · 67 days · 37.2%
- NO₂ · 37 days · 20.6%
- CO · 2 days · 1.1%
Health Impact Assessment
Moderate
Bergen County's air quality is rated Moderate based on 71.1% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 71.1% of monitored days in 2025, with a median AQI of 40. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is Ozone, driving AQI on 74 of 180 monitored days.
5-Year Air Quality Trend
Air quality is improving in Bergen County. Best year: 2024 (267 good days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 228 | 133 | 3 | 0 | 43 | 119 |
| 2021 | 230 | 126 | 9 | 0 | 43 | 147 |
| 2022 | 259 | 106 | 0 | 0 | 42 | 90 |
| 2023 | 204 | 152 | 5 | 4 | 48 | 197 |
| 2024 | 267 | 89 | 9 | 1 | 40 | 156 |
| 2025 | 128 | 51 | 1 | 0 | 40 | 108 |
How does Bergen County compare?
How Bergen County compares
Good-day share worse than US avg
Bergen County 71.1%
Atlantic County, New Jersey 79.6%
US average 76.5%
Median AQI worse than US avg
Bergen County 40
Atlantic County, New Jersey 38
US average 38
Unhealthy days / yr about average
Bergen County 0
Atlantic County, New Jersey 0
US average 0
Other Counties in New Jersey
Air quality comparison for nearby counties in New Jersey.
Counties with Similar Air Quality
Counties across the US with a similar median AQI to Bergen County.
Amador County, California
AQI 40 · 84.8% good
Anne Arundel County, Maryland
AQI 40 · 87.2% good
Arlington County, Virginia
AQI 40 · 84.8% good
Berkeley County, West Virginia
AQI 40 · 81.1% good
Billings County, North Dakota
AQI 40 · 80.3% good
Bossier County, Louisiana
AQI 40 · 86.5% good
What Bergen County's air means for you
The air here stays in the breathable range year-round, with Ozone the main thing to watch.
- Sensitive groups (asthma, heart conditions, children, older adults) should check the AQI on high-Ozone days, the guide explains what a median of 40 means for exposure. Health guidance
- See how Bergen County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Bergen County with its New Jersey neighbours before drawing a conclusion about the region. All of New Jersey
Based on 180 EPA-monitored days in 2025; figures reflect only days the monitors reported. Source: EPA Air Quality System annual summaries.
More Air Quality Data
Air Quality Guides
Frequently Asked Questions
What is the air quality in Bergen County, New Jersey? ▼
Bergen County has a median Air Quality Index (AQI) of 40, rated "Good." 71.1% of monitored days (128 out of 180) had good air quality in 2025.
What is the main pollutant in Bergen County? ▼
The primary pollutant in Bergen County is Ozone (O3), which was the main AQI driver on 74 days (41% of monitored days). Can trigger asthma, reduce lung function, and cause chest pain.
How many unhealthy air days does Bergen County have? ▼
In 2025, Bergen County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 108.
Is the air quality in Bergen County getting better or worse? ▼
Air quality in Bergen County is improving based on 5-year trends (2020-2025). Best year: 2024 with 267 good days. Worst year: 2025 with 128 good days.
What does AQI 40 mean for health? ▼
Bergen County's median AQI of 40 falls in the "Good" category. See the <a href="/guides/understanding-aqi" class="underline">AQI category guide</a> for what each range means for health.
How does Bergen County compare to other counties in New Jersey? ▼
Bergen County has 71.1% good air days. Nearby counties in New Jersey: Atlantic (79.6% good), Camden (69.4% good), Cumberland (73.0% good), Gloucester (72.4% good), Hudson (74.7% good), Hunterdon (73.6% good).
What is the 90th percentile AQI in Bergen County? ▼
The 90th percentile AQI for Bergen County is 60, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 108 (USG).
Data Sources
Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by County dataset, 2020–2025 (aqs.epa.gov). For current conditions (not shown here — this page is historical annual data), see EPA AirNow (airnow.gov). See our methodology for how AQI, median, and coverage figures are computed.
Informational only, not professional advice. Data from EPA AQS. See our disclaimer.
Every figure on PlainAir is rendered directly from EPA AQS air-quality monitoring data, no number is typed in by an editor. This page draws directly on EPA AQS air-quality monitoring data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.