Median AQI
41
Good
New Jersey · County air quality · 2025
Passaic County, New Jersey
Median AQI 41 (Good). 73.6% of monitored days rated Good, direct from EPA Air Quality System stations.
- 41
- Median AQI
- 73.6%
- Good-air days
- 0
- Unhealthy days
- 41%
- Cleaner than US counties
Passaic County's 2025 annual median AQI is 41 (Good), with 73.6% Good days
According to the U.S. EPA Air Quality System, Passaic County, New Jersey posted a 2025 median AQI of 41 (Good) across 364 monitored days, with 73.6% rated Good and 0 unhealthy or worse. This is an annual comparison, not today's advisory.
Data source EPA Air Quality System (AQS)
- Cleaner than US
- Passaic County's 73.6% Good-day share places it cleaner than 41% of US counties in 2025.
- Closest median-AQI peer
- Armstrong County (70.5% Good, median AQI 41) is the closest nationwide median-AQI peer to Passaic County.
- 2020–2025 trend
- Passaic County's floor-qualifying Good-day share is worsening from 2020 to 2025 (93.5% → 73.6%).
- Median AQI
- Median AQI: 41
The verdict
According to EPA Air Quality System monitoring data, Passaic County's air is good on balance, more polluted than the median US county, a median AQI of 41 with 73.6% of 364 monitored days in the Good band, driven mainly by Ozone.
- 41
- median AQI · Good
- 73.6%
- days rated Good
- Ozone
- main pollutant
- 41%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 115.
Annual release change
What changed in the 2025 EPA annual release
- Passaic County's median AQI rose from 38 to 41 between the 2024 and 2025 EPA annual releases, a change of +3 points.
Data updated August 2026
- Good · 268 d · 73.6%
- Moderate · 92 d · 25.3%
- USG · 4 d · 1.1%
How did Passaic County's air break down in 2025?
Across 364 monitored days, 268 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 115 (USG).
EPA AQS →Air quality data from EPA Air Quality System (2025). 364 days monitored. Median AQI: 41 (Good).
Insights: Passaic County, New Jersey. EPA monitors recorded a median Air Quality Index of 41 across 364 measured days in 2025, earning a Good classification and a Moderate health grade. Of those days, 268 (74%) fell in the Good band (AQI 0–50), 92 (25%) registered Moderate readings, and 4 (1%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 61, while the worst single-day peak hit 115 (USG). Residents averaged about 22.1 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as Ozone (184 days), PM2.5 (180 days). Across the 2020–2025 trend window, the share of monitored days rated Good shifted by -19.9 points (measured against 262 monitored days in 2020 and 364 in 2025, so raw day counts are not comparable) and the median AQI moved +4 points, placing the multi-year trajectory at worsening. The worst single reading over the 2020–2025 window was AQI 115, usg but never Unhealthy. Nearby counties show comparable readings: Atlantic (82.2% good, AQI 36); Bergen (71.1% good, AQI 40); Camden (65.6% good, AQI 44); Cumberland (76.2% good, AQI 40); Gloucester (78.7% good, AQI 39); Hudson (71.5% good, AQI 41).
Air Quality Summary
Good Days
73.6%
268 of 364 monitored days
-1.4pp vs 75% target
Max AQI Recorded
115
USG
Health Grade
Moderate
90th-pct AQI 61
Passaic County, Good days share 73.6%
National avg
Share of monitored days at AQI 0-50 (Good band).
Passaic 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 364 monitored days across EPA AQI categories.
Good
268
74%
Moderate
92
25%
USG
4
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 Passaic County.
- Ozone · 184 days · 50.5%
- PM2.5 · 180 days · 49.5%
Health Impact Assessment
Moderate
Passaic County's air quality is rated Moderate based on 73.6% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 73.6% of monitored days in 2025, with a median AQI of 41. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is Ozone, driving AQI on 184 of 364 monitored days.
5-Year Air Quality Trend
Air quality is worsening in Passaic County. Highest Good-day share: 2020 (93.5%, 245 of 262 monitored days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 245 | 17 | 0 | 0 | 37 | 100 |
| 2021 | 243 | 18 | 0 | 0 | 37 | 80 |
| 2022 | 251 | 53 | 0 | 0 | 38 | 90 |
| 2023 | 241 | 104 | 4 | 4 | 42 | 199 |
| 2024 | 269 | 95 | 2 | 0 | 38 | 119 |
| 2025 | 268 | 92 | 4 | 0 | 41 | 115 |
How does Passaic County compare?
How Passaic County compares
Good-day share worse than US avg
Passaic County 73.6%
Armstrong County, Pennsylvania 70.5%
US average 76.0%
Median AQI worse than US avg
Passaic County 41
Armstrong County, Pennsylvania 41
US average 39
Unhealthy days / yr better than US avg
Passaic County 0
Armstrong County, Pennsylvania 0
US average 1
Counties with a similar median AQI
Nationwide peers within about the same annual median AQI as Passaic County (41), not geographic neighbors.
Armstrong County, Pennsylvania
Median AQI 41 · 70.5% Good-day share
Benewah County, Idaho
Median AQI 41 · 63.4% Good-day share
Berrien County, Michigan
Median AQI 41 · 80.9% Good-day share
Callaway County, Missouri
Median AQI 41 · 89.6% Good-day share
Cambria County, Pennsylvania
Median AQI 41 · 74.5% Good-day share
Cass County, Missouri
Median AQI 41 · 77.6% Good-day share
Same primary pollutant: Ozone
Ozone led the AQI on the most monitored days here. These peers share that driver and the closest Good-day share (a second relationship type beyond median-AQI neighbors).
Custer County, South Dakota
73.6% Good-day share · median AQI 45
Rowan County, North Carolina
73.7% Good-day share · median AQI 43
Sandoval County, New Mexico
73.5% Good-day share · median AQI 44
Montgomery County, Pennsylvania
73.4% Good-day share · median AQI 41
Pueblo County, Colorado
73.4% Good-day share · median AQI 45
Saint Louis County, Missouri
73.4% Good-day share · median AQI 43
New Jersey counties on the map
Geographic containment only, other monitored counties in New Jersey, independent of AQI or pollutant match.
What Passaic 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 41 means for exposure. Health guidance
- See how Passaic County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Passaic County with its New Jersey neighbours before drawing a conclusion about the region. All of New Jersey
Based on 364 EPA-monitored days in 2025; figures reflect only days the monitors reported. Source: EPA Air Quality System annual summaries.
Keep exploring the annual AQI record
Air-quality reading list
Frequently Asked Questions
What is the air quality in Passaic County, New Jersey? ▼
Passaic County has a median Air Quality Index (AQI) of 41, rated "Good." 73.6% of monitored days (268 out of 364) had good air quality in 2025.
What is the main pollutant in Passaic County? ▼
The primary pollutant in Passaic County is Ozone (O3), which was the main AQI driver on 184 days (51% of monitored days). Can trigger asthma, reduce lung function, and cause chest pain.
How many unhealthy air days does Passaic County have? ▼
In 2025, Passaic County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 115.
Is the air quality in Passaic County getting better or worse? ▼
Air quality in Passaic County is worsening across floor-qualifying years (2020-2025); years with fewer than 100 monitored days are excluded from that direction. Highest qualifying Good-day share: 2020 at 93.5% (245 of 262 days). Lowest qualifying Good-day share: 2023 at 68.3% (241 of 353 days).
What does AQI 41 mean for health? ▼
Passaic County's median AQI of 41 falls in the "Good" category. See the AQI category guide for what each range means for health.
How does Passaic County compare to other counties in New Jersey? ▼
Passaic County has 73.6% good air days. Nearby counties in New Jersey: Atlantic (82.2% good), Bergen (71.1% good), Camden (65.6% good), Cumberland (76.2% good), Gloucester (78.7% good), Hudson (71.5% good).
What is the 90th percentile AQI in Passaic County? ▼
The 90th percentile AQI for Passaic County is 61, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 115 (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. Spotted a figure that looks wrong? Report a correction.
Source: U.S. EPA Air Quality System (AQS) Annual AQI by county summary files for Passaic County, New Jersey · 2020–2025
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Every figure on PlainAirData 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.