Atlantic City Air Quality in January
Across 2019–2025, Atlantic City's January air quality had a median AQI of 32 (Good) over 217 monitored days in the Atlantic City-Hammonton, NJ area. 0.0% of January days (0 of 217) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 50.7% of days. The cleanest January on record here was 2021 (median AQI 30, 0 days above 100) and the worst was 2025 (median 36, 0 days above 100, peak AQI 57).
- Good: 86.6%
- Moderate: 13.4%
- 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.
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How is the air in Atlantic City in January?
Good on a typical day: median AQI 32 across 2019–2025, with 0.0% of January days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓86.6% of January days were Good (AQI 0–50), 13.4% Moderate (51–100).
- ✓0 days of 217 reached AQI 101+; the January peak was 72.
- ✓Best January: 2021; worst January: 2025.
Frequently asked questions
What is the air quality like in Atlantic City in January?▾
Across 2019–2025, the median daily AQI in Atlantic City in January was 32 (Good). 86.6% of days were Good, 13.4% Moderate, and 0.0% reached Unhealthy for Sensitive Groups or worse, based on 217 monitored days in EPA's Air Quality System.
Is January a good time for outdoor exercise in Atlantic City?▾
A typical January day in Atlantic City sits in the Good range (median AQI 32), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of January days reached AQI 101+ in 2019–2025.
Which pollutant causes Atlantic City's January air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 50.7% of January days in Atlantic City. The highest January AQI recorded in 2019–2025 was 72 (Moderate), in 2025.
Atlantic City January air quality, year by year
Atlantic City January 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 | 31 | 32 | 0 | 63 | PM2.5 |
| 2020 | 31 | 32 | 0 | 55 | O3 |
| 2021cleanest | 31 | 30 | 0 | 72 | O3 |
| 2022 | 31 | 34 | 0 | 54 | O3 |
| 2023 | 31 | 30 | 0 | 57 | PM2.5 |
| 2024 | 31 | 31 | 0 | 55 | PM2.5 |
| 2025worst | 31 | 36 | 0 | 57 | O3 |
What January air means in Atlantic City
A typical January day in Atlantic City sits in the Good range (median AQI 32), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of January days reached AQI 101+ in 2019–2025.
January's median AQI of 32 is below Atlantic City's whole-year median of 37, making it one of the area's cleaner periods. Nationally, the median January AQI across every EPA metro area (95,602 metro-days, 2019–2025) is 39, so Atlantic City runs below the national January norm; 0.0% of its January days topped AQI 100 versus 0.7% nationally (about the same).
January is part of Atlantic City's winter season (December, January, February); the winter 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.