Trenton Air Quality in 2019
In 2019, Trenton's air quality (Trenton, NJ area) had a median daily AQI of 45 (Good) across 365 monitored days. 2 days (0.5%) reached Unhealthy for Sensitive Groups or worse, 232 were Good, and the year's peak AQI was 136 (Unhealthy for Sensitive Groups). Ground-level ozone set the daily AQI on 196 of those days. The cleanest month of 2019 was October (median AQI 33, 0 days above 100) and the worst was June (median 50, 2 days above 100, peak 136).
- Good: 63.6%
- Moderate: 35.9%
- Unhealthy for Sensitive Groups: 0.5%
- Unhealthy or worse: 0.0%
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How was Trenton's air quality in 2019?
Good on a typical day: median AQI 45, with 2 days above AQI 100 out of 365 monitored — the 1st cleanest of 7 years on record for the area.
- ✓Peak AQI in 2019: 136 (Unhealthy for Sensitive Groups).
- ✓Ground-level ozone was the main pollutant on 196 days.
- ✓Cleanest month: October; worst: June.
Frequently asked questions
What was the average AQI in Trenton in 2019?▾
EPA's Air Quality System puts Trenton's (Trenton, NJ) median daily AQI for 2019 at 45, which is Good. 2 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 136.
Which month had the worst air quality in Trenton in 2019?▾
The cleanest month of 2019 was October (median AQI 33, 0 days above 100) and the worst was June (median 50, 2 days above 100, peak 136).
Was 2019 a good or bad year for Trenton's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2019 ranks 1st cleanest by days above AQI 100 — the best year on record here. 2019's median of 45 is in line with the area's typical annual median of 45.
Trenton month by month in 2019
Trenton air quality month by month, 2019 (Trenton, NJ, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 31 | 38 | 0 | 76 | PM2.5 |
| February | 28 | 40 | 0 | 94 | PM2.5 |
| March | 31 | 46 | 0 | 69 | O3 |
| April | 30 | 44 | 0 | 71 | O3 |
| May | 31 | 44 | 0 | 58 | O3 |
| Juneworst | 30 | 50 | 2 | 136 | O3 |
| July | 31 | 54 | 0 | 97 | PM2.5 |
| August | 31 | 52 | 0 | 80 | O3 |
| September | 30 | 48 | 0 | 90 | O3 |
| Octobercleanest | 31 | 33 | 0 | 56 | O3 |
| November | 30 | 36 | 0 | 76 | PM2.5 |
| December | 31 | 42 | 0 | 96 | PM2.5 |
How 2019 compares
Among the 7 years EPA has published for the area (2019–2025), 2019 ranks 1st cleanest by days above AQI 100 — the best year on record here.
2019's median of 45 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 50 (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.