Trenton Air Quality in Summer
Across 2019–2025, Trenton's summer (June–August) air quality had a median AQI of 52 (Moderate) over 644 monitored days in the Trenton, NJ area. 5.1% of summer days (33 of 644) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 54.7% of days. The cleanest summer on record here was 2019 (median AQI 52, 2 days above 100) and the worst was 2023 (median 57, 9 days above 100, peak AQI 244).
- Good: 43.6%
- Moderate: 51.2%
- Unhealthy for Sensitive Groups: 4.3%
- Unhealthy or worse: 0.8%
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 summer?
Moderate on a typical day: median AQI 52 across 2019–2025, with 5.1% of summer days above AQI 100. Ground-level ozone is the main driver.
- ✓43.6% of summer days were Good (AQI 0–50), 51.2% Moderate (51–100).
- ✓33 days of 644 reached AQI 101+; the summer peak was 244.
- ✓Cleanest month: August; worst month: June.
Frequently asked questions
What is the air quality like in Trenton in summer?▾
Across 2019–2025, the median daily AQI in Trenton in summer was 52 (Moderate). 43.6% of days were Good, 51.2% Moderate, and 5.1% reached Unhealthy for Sensitive Groups or worse, based on 644 monitored days in EPA's Air Quality System.
Is summer a good time for outdoor exercise in Trenton?▾
A typical summer day in Trenton is Moderate (median AQI 52): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 20 of summer days (5.1%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
Which pollutant causes Trenton's summer air quality problems?▾
Ground-level ozone set the daily AQI on 54.7% of summer days in Trenton. The highest summer AQI recorded in 2019–2025 was 244 (Very Unhealthy), in 2023.
Trenton summer air quality, year by year
Trenton summer air quality by year (Trenton, NJ, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019cleanest | 92 | 52 | 2 | 136 | O3 |
| 2020 | 92 | 46 | 3 | 112 | O3 |
| 2021 | 92 | 54 | 6 | 130 | PM2.5 |
| 2022 | 92 | 52 | 3 | 119 | O3 |
| 2023worst | 92 | 57 | 9 | 244 | PM2.5 |
| 2024 | 92 | 55 | 5 | 133 | O3 |
| 2025 | 92 | 50 | 5 | 126 | O3 |
What summer air means in Trenton
A typical summer day in Trenton is Moderate (median AQI 52): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 20 of summer days (5.1%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
Summer's median AQI of 52 is above Trenton's whole-year median of 45, making it one of the area's dirtier periods. Nationally, the median Summer AQI across every EPA metro area (308,645 metro-days, 2019–2025) is 46, so Trenton runs above the national Summer norm; 5.1% of its Summer days topped AQI 100 versus 3.6% nationally (above average).
Within the season, August is the cleanest month (median AQI 50, 1.8% of days above 100) and June the worst (median 53, 8.1% 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.