Trenton Air Quality in July
Across 2019–2025, Trenton's July air quality had a median AQI of 54 (Moderate) over 217 monitored days in the Trenton, NJ area. 5.5% of July days (12 of 217) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 53.5% of days. The cleanest July on record here was 2019 (median AQI 54, 0 days above 100) and the worst was 2021 (median 57, 3 days above 100, peak AQI 130).
- Good: 36.9%
- Moderate: 57.6%
- Unhealthy for Sensitive Groups: 5.5%
- 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 July?
Moderate on a typical day: median AQI 54 across 2019–2025, with 5.5% of July days above AQI 100. Ground-level ozone is the main driver.
- ✓36.9% of July days were Good (AQI 0–50), 57.6% Moderate (51–100).
- ✓12 days of 217 reached AQI 101+; the July peak was 130.
- ✓Best July: 2019; worst July: 2021.
Frequently asked questions
What is the air quality like in Trenton in July?▾
Across 2019–2025, the median daily AQI in Trenton in July was 54 (Moderate). 36.9% of days were Good, 57.6% Moderate, and 5.5% reached Unhealthy for Sensitive Groups or worse, based on 217 monitored days in EPA's Air Quality System.
Is July a good time for outdoor exercise in Trenton?▾
A typical July day in Trenton is Moderate (median AQI 54): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 18 of July days (5.5%) 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 July air quality problems?▾
Ground-level ozone set the daily AQI on 53.5% of July days in Trenton. The highest July AQI recorded in 2019–2025 was 130 (Unhealthy for Sensitive Groups), in 2021.
Trenton July air quality, year by year
Trenton July air quality by year (Trenton, NJ, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019cleanest | 31 | 54 | 0 | 97 | PM2.5 |
| 2020 | 31 | 46 | 1 | 108 | O3 |
| 2021worst | 31 | 57 | 3 | 130 | PM2.5 |
| 2022 | 31 | 56 | 3 | 119 | O3 |
| 2023 | 31 | 64 | 2 | 126 | PM2.5 |
| 2024 | 31 | 53 | 2 | 119 | O3 |
| 2025 | 31 | 49 | 1 | 126 | O3 |
What July air means in Trenton
A typical July day in Trenton is Moderate (median AQI 54): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 18 of July days (5.5%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
July's median AQI of 54 is above Trenton's whole-year median of 45, making it one of the area's dirtier periods. Nationally, the median July AQI across every EPA metro area (103,858 metro-days, 2019–2025) is 47, so Trenton runs above the national July norm; 5.5% of its July days topped AQI 100 versus 3.6% nationally (above average).
July is part of Trenton's summer season (June, July, August); the summer 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.