Median AQI
40
Good
New Jersey · County air quality · 2025
Cumberland County, New Jersey
Median AQI 40 (Good). 76.2% of monitored days rated Good, direct from EPA Air Quality System stations.
- 40
- Median AQI
- 76.2%
- Good-air days
- 0
- Unhealthy days
- 47%
- Cleaner than US counties
Cumberland County's 2025 annual median AQI is 40 (Good), with 76.2% Good days
According to the U.S. EPA Air Quality System, Cumberland County, New Jersey posted a 2025 median AQI of 40 (Good) across 362 monitored days, with 76.2% 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
- Cumberland County's 76.2% Good-day share places it cleaner than 47% of US counties in 2025.
- Closest median-AQI peer
- Anderson County (91.3% Good, median AQI 40) is the closest nationwide median-AQI peer to Cumberland County.
- 2020–2025 trend
- Cumberland County's floor-qualifying Good-day share is improving from 2020 to 2025 (68.8% → 76.2%).
- Median AQI
- Median AQI: 40
The verdict
According to EPA Air Quality System monitoring data, Cumberland County's air is good on balance, more polluted than the median US county, a median AQI of 40 with 76.2% of 362 monitored days in the Good band, driven mainly by Ozone.
- 40
- median AQI · Good
- 76.2%
- days rated Good
- Ozone
- main pollutant
- 47%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 123.
Annual release change
What changed in the 2025 EPA annual release
- Cumberland County's Good-day share fell from 80.8% to 76.2% between the 2024 and 2025 EPA annual releases, a change of -4.5 percentage points.
- Cumberland County's peak single-day AQI rose from 112 to 123 between the 2024 and 2025 EPA annual releases, a change of +11 points.
Data updated August 2026
- Good · 276 d · 76.2%
- Moderate · 83 d · 22.9%
- USG · 3 d · 0.8%
How did Cumberland County's air break down in 2025?
Across 362 monitored days, 276 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 123 (USG).
EPA AQS →Air quality data from EPA Air Quality System (2025). 362 days monitored. Median AQI: 40 (Good).
Insights: Cumberland County, New Jersey. EPA monitors recorded a median Air Quality Index of 40 across 362 measured days in 2025, earning a Good classification and a Good health grade. Of those days, 276 (76%) fell in the Good band (AQI 0–50), 83 (23%) registered Moderate readings, and 3 (1%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 59, while the worst single-day peak hit 123 (USG). Residents averaged about 22.9 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as Ozone (212 days), PM2.5 (150 days). Across the 2020–2025 trend window, the share of monitored days rated Good shifted by +7.5 points and the median AQI moved -4 points, placing the multi-year trajectory at improving. The worst single reading over the 2020–2025 window was AQI 123, 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); Gloucester (78.7% good, AQI 39); Hudson (71.5% good, AQI 41); Hunterdon (74.2% good, AQI 41).
Air Quality Summary
Good Days
76.2%
276 of 362 monitored days
1.2pp vs 75% target
Max AQI Recorded
123
USG
Health Grade
Good
90th-pct AQI 59
Cumberland County, Good days share 76.2%
National avg
Share of monitored days at AQI 0-50 (Good band).
Cumberland 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 362 monitored days across EPA AQI categories.
Good
276
76%
Moderate
83
23%
USG
3
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 Cumberland County.
- Ozone · 212 days · 58.6%
- PM2.5 · 150 days · 41.4%
Health Impact Assessment
Good
Cumberland County's air quality is rated Good based on 76.2% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 76.2% 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 212 of 362 monitored days.
5-Year Air Quality Trend
Air quality is improving in Cumberland County. Highest Good-day share: 2022 (85.1%, 308 of 362 monitored days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 251 | 114 | 0 | 0 | 44 | 72 |
| 2021 | 291 | 71 | 2 | 0 | 39 | 112 |
| 2022 | 308 | 54 | 0 | 0 | 38 | 84 |
| 2023 | 262 | 94 | 3 | 1 | 43 | 203 |
| 2024 | 290 | 68 | 1 | 0 | 39 | 112 |
| 2025 | 276 | 83 | 3 | 0 | 40 | 123 |
How does Cumberland County compare?
How Cumberland County compares
Good-day share about typical
Cumberland County 76.2%
Anderson County, South Carolina 91.3%
Typical US county 76.0%
Median AQI worse than typical
Cumberland County 40
Anderson County, South Carolina 40
Typical US county 39
Unhealthy days / yr better than typical
Cumberland County 0
Anderson County, South Carolina 0
Typical US county 1
Counties with a similar median AQI
Nationwide peers within about the same annual median AQI as Cumberland County (40), not geographic neighbors.
Anderson County, South Carolina
Median AQI 40 · 91.3% Good-day share
Andrew County, Missouri
Median AQI 40 · 86.9% Good-day share
Anne Arundel County, Maryland
Median AQI 40 · 87.6% Good-day share
Bergen County, New Jersey
Median AQI 40 · 71.1% Good-day share
Blair County, Pennsylvania
Median AQI 40 · 76.9% Good-day share
Brazos County, Texas
Median AQI 40 · 68.5% 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).
Cass County, North Dakota
76.2% Good-day share · median AQI 37
Burke County, North Dakota
76.2% Good-day share · median AQI 38
Lee County, Florida
76.4% Good-day share · median AQI 40
York County, South Carolina
76.5% Good-day share · median AQI 43
San Juan County, Utah
75.9% Good-day share · median AQI 44
La Paz County, Arizona
76.6% Good-day share · median AQI 44
New Jersey counties on the map
Geographic containment only, other monitored counties in New Jersey, independent of AQI or pollutant match.
What Cumberland 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 Cumberland County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Cumberland County with its New Jersey neighbours before drawing a conclusion about the region. All of New Jersey
Based on 362 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 Cumberland County, New Jersey? ▼
Cumberland County has a median Air Quality Index (AQI) of 40, rated "Good." 76.2% of monitored days (276 out of 362) had good air quality in 2025.
What is the main pollutant in Cumberland County? ▼
The primary pollutant in Cumberland County is Ozone (O3), which was the main AQI driver on 212 days (59% of monitored days). Can trigger asthma, reduce lung function, and cause chest pain.
How many unhealthy air days does Cumberland County have? ▼
In 2025, Cumberland County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 123.
Is the air quality in Cumberland County getting better or worse? ▼
Air quality in Cumberland County is improving across floor-qualifying years (2020-2025); years with fewer than 100 monitored days are excluded from that direction. Highest qualifying Good-day share: 2022 at 85.1% (308 of 362 days). Lowest qualifying Good-day share: 2020 at 68.8% (251 of 365 days).
What does AQI 40 mean for health? ▼
Cumberland County's median AQI of 40 falls in the "Good" category. See the AQI category guide for what each range means for health.
How does Cumberland County compare to other counties in New Jersey? ▼
Cumberland County has 76.2% good air days. Nearby counties in New Jersey: Atlantic (82.2% good), Bergen (71.1% good), Camden (65.6% good), Gloucester (78.7% good), Hudson (71.5% good), Hunterdon (74.2% good).
What is the 90th percentile AQI in Cumberland County? ▼
The 90th percentile AQI for Cumberland County is 59, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 123 (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 Cumberland 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.