Trenton Air Quality in Winter
Across 2019–2025, Trenton's winter (December–February) air quality had a median AQI of 41 (Good) over 632 monitored days in the Trenton, NJ area. 0.0% of winter days (0 of 632) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 70.9% of days. The cleanest winter on record here was 2024 (median AQI 38, 0 days above 100) and the worst was 2023 (median 47, 0 days above 100, peak AQI 83).
- Good: 64.4%
- Moderate: 35.6%
- Unhealthy for Sensitive Groups: 0.0%
- 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 is the air in Trenton in winter?
Good on a typical day: median AQI 41 across 2019–2025, with 0.0% of winter days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓64.4% of winter days were Good (AQI 0–50), 35.6% Moderate (51–100).
- ✓0 days of 632 reached AQI 101+; the winter peak was 96.
- ✓Cleanest month: January; worst month: December.
Frequently asked questions
What is the air quality like in Trenton in winter?▾
Across 2019–2025, the median daily AQI in Trenton in winter was 41 (Good). 64.4% of days were Good, 35.6% Moderate, and 0.0% reached Unhealthy for Sensitive Groups or worse, based on 632 monitored days in EPA's Air Quality System.
Is winter a good time for outdoor exercise in Trenton?▾
A typical winter day in Trenton sits in the Good range (median AQI 41), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of winter days reached AQI 101+ in 2019–2025.
Which pollutant causes Trenton's winter air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 70.9% of winter days in Trenton. The highest winter AQI recorded in 2019–2025 was 96 (Moderate), in 2023.
Trenton winter air quality, year by year
Trenton winter air quality by year (Trenton, NJ, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 90 | 40 | 0 | 96 | PM2.5 |
| 2020 | 91 | 39 | 0 | 81 | PM2.5 |
| 2021 | 90 | 44 | 0 | 77 | PM2.5 |
| 2022 | 90 | 45 | 0 | 76 | PM2.5 |
| 2023worst | 90 | 47 | 0 | 83 | PM2.5 |
| 2024cleanest | 91 | 38 | 0 | 77 | PM2.5 |
| 2025 | 90 | 38 | 0 | 73 | PM2.5 |
What winter air means in Trenton
A typical winter day in Trenton sits in the Good range (median AQI 41), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of winter days reached AQI 101+ in 2019–2025.
Winter's median AQI of 41 is below Trenton's whole-year median of 45, making it one of the area's cleaner periods. Nationally, the median Winter AQI across every EPA metro area (278,620 metro-days, 2019–2025) is 40, so Trenton runs in line with the national Winter norm; 0.0% of its Winter days topped AQI 100 versus 0.6% nationally (about the same).
Within the season, January is the cleanest month (median AQI 38, 0.0% of days above 100) and December the worst (median 42, 0.0% above 100).
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 season 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.