Atlantic City Air Quality in Winter
Across 2019–2025, Atlantic City's winter (December–February) air quality had a median AQI of 34 (Good) over 631 monitored days in the Atlantic City-Hammonton, NJ area. 0.0% of winter days (0 of 631) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 55.0% of days. The cleanest winter on record here was 2022 (median AQI 32, 0 days above 100) and the worst was 2020 (median 36, 0 days above 100, peak AQI 77).
- Good: 85.4%
- Moderate: 14.6%
- 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 winter?
Good on a typical day: median AQI 34 across 2019–2025, with 0.0% of winter days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓85.4% of winter days were Good (AQI 0–50), 14.6% Moderate (51–100).
- ✓0 days of 631 reached AQI 101+; the winter peak was 77.
- ✓Cleanest month: January; worst month: February.
Frequently asked questions
What is the air quality like in Atlantic City in winter?▾
Across 2019–2025, the median daily AQI in Atlantic City in winter was 34 (Good). 85.4% of days were Good, 14.6% Moderate, and 0.0% reached Unhealthy for Sensitive Groups or worse, based on 631 monitored days in EPA's Air Quality System.
Is winter a good time for outdoor exercise in Atlantic City?▾
A typical winter day in Atlantic City sits in the Good range (median AQI 34), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of winter days reached AQI 101+ in 2019–2025.
Which pollutant causes Atlantic City's winter air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 55.0% of winter days in Atlantic City. The highest winter AQI recorded in 2019–2025 was 77 (Moderate), in 2020.
Atlantic City winter air quality, year by year
Atlantic City winter 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 | 90 | 36 | 0 | 74 | PM2.5 |
| 2020worst | 91 | 36 | 0 | 77 | PM2.5 |
| 2021 | 89 | 34 | 0 | 72 | PM2.5 |
| 2022cleanest | 90 | 32 | 0 | 61 | PM2.5 |
| 2023 | 90 | 33 | 0 | 61 | PM2.5 |
| 2024 | 91 | 33 | 0 | 66 | PM2.5 |
| 2025 | 90 | 34 | 0 | 62 | O3 |
What winter air means in Atlantic City
A typical winter day in Atlantic City sits in the Good range (median AQI 34), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of winter days reached AQI 101+ in 2019–2025.
Winter's median AQI of 34 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 Winter AQI across every EPA metro area (278,620 metro-days, 2019–2025) is 40, so Atlantic City runs below the national Winter norm; 0.0% of its Winter days topped AQI 100 versus 0.6% nationally (about the same).
Within the season, January is the cleanest month (median AQI 32, 0.0% of days above 100) and February the worst (median 35, 0.0% above 100).
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 season 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.