Median AQI
41
Good
New Jersey · County air quality · 2025
Hudson County, New Jersey
Median AQI 41 (Good). 74.7% of monitored days rated Good, direct from EPA Air Quality System stations.
- 41
- Median AQI
- 74.7%
- Good-air days
- 0
- Unhealthy days
- 40%
- Cleaner than US counties
The verdict
According to EPA Air Quality System monitoring data, Hudson County's air is good on balance, more polluted than the median US county, a median AQI of 41 with 74.7% of 182 monitored days in the Good band, driven mainly by PM2.5.
- 41
- median AQI · Good
- 74.7%
- days rated Good
- PM2.5
- main pollutant
- 40%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 133.
Data updated July 2026
- Good · 136 d · 74.7%
- Moderate · 45 d · 24.7%
- USG · 1 d · 0.5%
How did Hudson County's air break down in 2025?
Across 182 monitored days, 136 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 133 (USG).
EPA AQS →Air quality data from EPA Air Quality System (2025). 182 days monitored. Median AQI: 41 (Good).
Insights: Hudson County, New Jersey. EPA monitors recorded a median Air Quality Index of 41 across 182 measured days in 2025, earning a Good classification and a Moderate health grade. Of those days, 136 (75%) fell in the Good band (AQI 0–50), 45 (25%) registered Moderate readings, and 1 (1%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 57, while the worst single-day peak hit 133 (USG). Residents averaged about 22.4 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as PM2.5 (66 days), NO2 (66 days), Ozone (49 days), CO (1 days). Across the 2020–2025 trend window, good days shifted by -123 and the median AQI moved +2 points, placing the multi-year trajectory at improving. The worst single reading over the 2020–2025 window was AQI 133, usg but never Unhealthy. Nearby counties show comparable readings: Atlantic (79.6% good, AQI 38); Bergen (71.1% good, AQI 40); Camden (69.4% good, AQI 44); Cumberland (73.0% good, AQI 42); Gloucester (72.4% good, AQI 43); Hunterdon (73.6% good, AQI 41).
Air Quality Summary
Good Days
74.7%
136 of 182 monitored days
-0.3pp vs 75% target
Max AQI Recorded
133
USG
Health Grade
Moderate
90th-pct AQI 57
Hudson County, Good days share 74.7%
National avg
Share of monitored days at AQI 0-50 (Good band).
Hudson 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 182 monitored days across EPA AQI categories.
Good
136
75%
Moderate
45
25%
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 Hudson County.
- PM2.5 · 66 days · 36.3%
- NO₂ · 66 days · 36.3%
- Ozone · 49 days · 26.9%
- CO · 1 days · 0.5%
Health Impact Assessment
Moderate
Hudson County's air quality is rated Moderate based on 74.7% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 74.7% 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 PM2.5, driving AQI on 66 of 182 monitored days.
5-Year Air Quality Trend
Air quality is improving in Hudson County. Best year: 2024 (261 good days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 259 | 107 | 0 | 0 | 39 | 90 |
| 2021 | 216 | 146 | 3 | 0 | 44 | 126 |
| 2022 | 232 | 131 | 2 | 0 | 44 | 115 |
| 2023 | 218 | 142 | 1 | 3 | 44 | 203 |
| 2024 | 261 | 102 | 2 | 1 | 41 | 151 |
| 2025 | 136 | 45 | 1 | 0 | 41 | 133 |
How does Hudson County compare?
How Hudson County compares
Good-day share worse than US avg
Hudson County 74.7%
Atlantic County, New Jersey 79.6%
US average 76.5%
Median AQI worse than US avg
Hudson County 41
Atlantic County, New Jersey 38
US average 38
Unhealthy days / yr about average
Hudson 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 Hudson County.
Albemarle County, Virginia
AQI 41 · 77.9% good
Anderson County, South Carolina
AQI 41 · 90.0% good
Berkshire County, Massachusetts
AQI 41 · 71.6% good
Berrien County, Michigan
AQI 41 · 80.9% good
Blair County, Pennsylvania
AQI 41 · 71.9% good
Bonner County, Idaho
AQI 41 · 71.3% good
What Hudson County's air means for you
The air here stays in the breathable range year-round, with PM2.5 the main thing to watch.
- Sensitive groups (asthma, heart conditions, children, older adults) should check the AQI on high-PM2.5 days, the guide explains what a median of 41 means for exposure. Health guidance
- See how Hudson County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Hudson County with its New Jersey neighbours before drawing a conclusion about the region. All of New Jersey
Based on 182 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 Hudson County, New Jersey? ▼
Hudson County has a median Air Quality Index (AQI) of 41, rated "Good." 74.7% of monitored days (136 out of 182) had good air quality in 2025.
What is the main pollutant in Hudson County? ▼
The primary pollutant in Hudson County is Fine Particles (PM2.5), which was the main AQI driver on 66 days (36% of monitored days). Penetrates deep into lungs and bloodstream. Linked to heart disease and premature death.
How many unhealthy air days does Hudson County have? ▼
In 2025, Hudson County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 133.
Is the air quality in Hudson County getting better or worse? ▼
Air quality in Hudson County is improving based on 5-year trends (2020-2025). Best year: 2024 with 261 good days. Worst year: 2025 with 136 good days.
What does AQI 41 mean for health? ▼
Hudson County's median AQI of 41 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 Hudson County compare to other counties in New Jersey? ▼
Hudson County has 74.7% good air days. Nearby counties in New Jersey: Atlantic (79.6% good), Bergen (71.1% good), Camden (69.4% good), Cumberland (73.0% good), Gloucester (72.4% good), Hunterdon (73.6% good).
What is the 90th percentile AQI in Hudson County? ▼
The 90th percentile AQI for Hudson County is 57, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 133 (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.