Trenton Air Quality in March
Across 2019–2025, Trenton's March air quality had a median AQI of 43 (Good) over 217 monitored days in the Trenton, NJ area. 0.0% of March days (0 of 217) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 63.1% of days. The cleanest March on record here was 2024 (median AQI 38, 0 days above 100) and the worst was 2019 (median 46, 0 days above 100, peak AQI 69).
- Good: 79.7%
- Moderate: 20.3%
- 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 March?
Good on a typical day: median AQI 43 across 2019–2025, with 0.0% of March days above AQI 100. Ground-level ozone is the main driver.
- ✓79.7% of March days were Good (AQI 0–50), 20.3% Moderate (51–100).
- ✓0 days of 217 reached AQI 101+; the March peak was 77.
- ✓Best March: 2024; worst March: 2019.
Frequently asked questions
What is the air quality like in Trenton in March?▾
Across 2019–2025, the median daily AQI in Trenton in March was 43 (Good). 79.7% of days were Good, 20.3% Moderate, and 0.0% reached Unhealthy for Sensitive Groups or worse, based on 217 monitored days in EPA's Air Quality System.
Is March a good time for outdoor exercise in Trenton?▾
A typical March day in Trenton sits in the Good range (median AQI 43), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of March days reached AQI 101+ in 2019–2025.
Which pollutant causes Trenton's March air quality problems?▾
Ground-level ozone set the daily AQI on 63.1% of March days in Trenton. The highest March AQI recorded in 2019–2025 was 77 (Moderate), in 2019.
Trenton March air quality, year by year
Trenton March air quality by year (Trenton, NJ, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019worst | 31 | 46 | 0 | 69 | O3 |
| 2020 | 31 | 39 | 0 | 58 | O3 |
| 2021 | 31 | 42 | 0 | 74 | O3 |
| 2022 | 31 | 43 | 0 | 66 | O3 |
| 2023 | 31 | 44 | 0 | 66 | PM2.5 |
| 2024cleanest | 31 | 38 | 0 | 77 | O3 |
| 2025 | 31 | 42 | 0 | 59 | O3 |
What March air means in Trenton
A typical March day in Trenton sits in the Good range (median AQI 43), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of March days reached AQI 101+ in 2019–2025.
March's median AQI of 43 is in line with Trenton's whole-year median of 45, so this period is neither a clean nor a dirty stretch for the area. Nationally, the median March AQI across every EPA metro area (102,455 metro-days, 2019–2025) is 42, so Trenton runs in line with the national March norm; 0.0% of its March days topped AQI 100 versus 0.4% nationally (about the same).
March is part of Trenton's spring season (March, April, May); the spring page pools all three months.
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 month 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.