Atlantic City Air Quality in September
Across 2019–2025, Atlantic City's September air quality had a median AQI of 36 (Good) over 209 monitored days in the Atlantic City-Hammonton, NJ area. 0.0% of September days (0 of 209) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 56.5% of days. The cleanest September on record here was 2022 (median AQI 29, 0 days above 100) and the worst was 2023 (median 39, 0 days above 100, peak AQI 90).
- Good: 88.0%
- Moderate: 12.0%
- Unhealthy for Sensitive Groups: 0.0%
- Unhealthy or worse: 0.0%
Reduce Indoor Ozone in Atlantic City
Today's main pollutant in Atlantic City is ground-level ozone (AQI 31). Important: standard HEPA filters do NOT remove ozone — only a purifier with a substantial activated-carbon bed adsorbs it. The biggest wins are cutting indoor sources (gas appliances, certain "ionizer" purifiers) and ventilating when outdoor ozone is low (early morning). A high-carbon unit helps with the gases and VOCs that linger indoors.
Recommended: Levoit Core 300 — True HEPA + activated carbon · CADR ~141 CFM · rooms up to 219 sq ft
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How is the air in Atlantic City in September?
Good on a typical day: median AQI 36 across 2019–2025, with 0.0% of September days above AQI 100. Ground-level ozone is the main driver.
- ✓88.0% of September days were Good (AQI 0–50), 12.0% Moderate (51–100).
- ✓0 days of 209 reached AQI 101+; the September peak was 90.
- ✓Best September: 2022; worst September: 2023.
Frequently asked questions
What is the air quality like in Atlantic City in September?▾
Across 2019–2025, the median daily AQI in Atlantic City in September was 36 (Good). 88.0% of days were Good, 12.0% Moderate, and 0.0% reached Unhealthy for Sensitive Groups or worse, based on 209 monitored days in EPA's Air Quality System.
Is September a good time for outdoor exercise in Atlantic City?▾
A typical September day in Atlantic City sits in the Good range (median AQI 36), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of September days reached AQI 101+ in 2019–2025.
Which pollutant causes Atlantic City's September air quality problems?▾
Ground-level ozone set the daily AQI on 56.5% of September days in Atlantic City. The highest September AQI recorded in 2019–2025 was 90 (Moderate), in 2023.
Atlantic City September air quality, year by year
Atlantic City September air quality by year (Atlantic City-Hammonton, NJ, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 30 | 37 | 0 | 52 | O3 |
| 2020 | 29 | 33 | 0 | 57 | PM2.5 |
| 2021 | 30 | 36 | 0 | 62 | PM2.5 |
| 2022cleanest | 30 | 29 | 0 | 53 | O3 |
| 2023worst | 30 | 39 | 0 | 90 | O3 |
| 2024 | 30 | 35 | 0 | 54 | O3 |
| 2025 | 30 | 38 | 0 | 48 | O3 |
What September air means in Atlantic City
A typical September day in Atlantic City sits in the Good range (median AQI 36), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of September days reached AQI 101+ in 2019–2025.
September's median AQI of 36 is in line with Atlantic City's whole-year median of 37, so this period is neither a clean nor a dirty stretch for the area. Nationally, the median September AQI across every EPA metro area (100,699 metro-days, 2019–2025) is 43, so Atlantic City runs below the national September norm; 0.0% of its September days topped AQI 100 versus 2.7% nationally (below average).
September is part of Atlantic City's fall season (September, October, November); the fall page pools all three months.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Atlantic City
The latest EPA AirNow observation puts Atlantic City's AQI at 31 (O3). The figures above are multi-year month statistics, not today's reading.
View current Atlantic City air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Atlantic City-Hammonton, 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.