Trenton Air Quality in 2025
In 2025, Trenton's air quality (Trenton, NJ area) had a median daily AQI of 43 (Good) across 365 monitored days. 6 days (1.6%) reached Unhealthy for Sensitive Groups or worse, 255 were Good, and the year's peak AQI was 126 (Unhealthy for Sensitive Groups). Ground-level ozone set the daily AQI on 218 of those days. The cleanest month of 2025 was December (median AQI 36, 0 days above 100) and the worst was June (median 55, 3 days above 100, peak 122).
- Good: 69.9%
- Moderate: 28.5%
- Unhealthy for Sensitive Groups: 1.6%
- Unhealthy or worse: 0.0%
Extra Protection for Trenton Homes
Air quality in Trenton is moderate (AQI 52), with fine particles (PM2.5) the main concern. A True-HEPA purifier gives sensitive groups — kids, seniors and anyone with asthma or allergies — cleaner air indoors on days like today.
Recommended: Coway AP-1512HH Mighty — True HEPA + carbon · CADR ~246 CFM · rooms up to 361 sq ft
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How was Trenton's air quality in 2025?
Good on a typical day: median AQI 43, with 6 days above AQI 100 out of 365 monitored — the 5th cleanest of 7 years on record for the area.
- ✓Peak AQI in 2025: 126 (Unhealthy for Sensitive Groups).
- ✓Ground-level ozone was the main pollutant on 218 days.
- ✓Cleanest month: December; worst: June.
Frequently asked questions
What was the average AQI in Trenton in 2025?▾
EPA's Air Quality System puts Trenton's (Trenton, NJ) median daily AQI for 2025 at 43, which is Good. 6 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 126.
Which month had the worst air quality in Trenton in 2025?▾
The cleanest month of 2025 was December (median AQI 36, 0 days above 100) and the worst was June (median 55, 3 days above 100, peak 122).
Was 2025 a good or bad year for Trenton's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2025 ranks 5th cleanest by days above AQI 100. 2025's median of 43 is in line with the area's typical annual median of 45.
Trenton month by month in 2025
Trenton air quality month by month, 2025 (Trenton, NJ, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 31 | 38 | 0 | 73 | PM2.5 |
| February | 28 | 39 | 0 | 62 | O3 |
| March | 31 | 42 | 0 | 59 | O3 |
| April | 30 | 45 | 0 | 90 | O3 |
| May | 31 | 40 | 0 | 93 | O3 |
| Juneworst | 30 | 55 | 3 | 122 | O3 |
| July | 31 | 49 | 1 | 126 | O3 |
| August | 31 | 46 | 1 | 101 | O3 |
| September | 30 | 45 | 0 | 61 | O3 |
| October | 31 | 33 | 1 | 108 | O3 |
| November | 30 | 38 | 0 | 62 | PM2.5 |
| Decembercleanest | 31 | 36 | 0 | 69 | PM2.5 |
How 2025 compares
Among the 7 years EPA has published for the area (2019–2025), 2025 ranks 5th cleanest by days above AQI 100.
2025's median of 43 is in line with the area's typical annual median of 45.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Trenton
The latest EPA AirNow observation puts Trenton's AQI at 52 (PM2.5). The figures above are multi-year annual statistics, not today's reading.
View current Trenton air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Trenton, NJ), 2019–2025. Daily AQI per CBSA is the highest AQI reported by any monitor in the area that day; the defining parameter is the pollutant that set it. Month and season statistics pool every such day in the period across all years listed. Retrieved 2026-09-09.