Bad Air Days in Ocean County, New Jersey: 4 a Year
4 bad air days a year
About the middle of monitored US counties. Ranked 264 of 996 monitored counties, where 1 is worst.
What makes them bad: mostly ozone: summer smog (17% particle days).
When the bad days come in Ocean
- J
- F
- M
- A
- M
- J
- J
- A
- S
- O
- N
- D
Most bad days here fall in June and July and May. Averaged over 2016 to 2025.
What to buy, and what not to
- Ozone drives many bad days here. Purifiers and filters do not remove ozone, so do not buy one for that. Ozone peaks on hot afternoons: exercise outside in the morning.
The worst days on file
In 2000 to 2009 this county averaged 39 bad days a year; in 2016 to 2025, 4. The air has improved. The worst recent year was 2023, with 9 bad days on 365 monitored days.
| Date | AQI | Main pollutant |
|---|---|---|
| 2023-06-07 | 248 | PM2.5 |
| 2023-06-08 | 191 | PM2.5 |
| 2016-05-25 | 161 | Ozone |
| 2025-06-12 | 154 | Ozone |
| 2019-07-02 | 150 | Ozone |
The air on a normal day
Across 3,584 monitored days from 2016 to 2025, the air in Ocean County rated Good on 76% of them, more often than the 72% typical of monitored counties, and Moderate on 23%. The median day sat at AQI 40; one day in ten went above 60.
The pollutant setting the AQI on an ordinary day here:
- ozone50%1,807 days
- fine particles (PM2.5)50%1,777 days
Every recent year on file
| Year | Days monitored | Good | Moderate | Over 100 | Over 150 | Median AQI | Highest AQI |
|---|---|---|---|---|---|---|---|
| 2025* | 363 | 286 | 76 | 1 | 1 | 39 | 154 |
| 2024 | 366 | 280 | 82 | 4 | 0 | 41 | 140 |
| 2023 | 365 | 261 | 95 | 9 | 2 | 42 | 248 |
| 2022 | 358 | 287 | 68 | 3 | 0 | 40 | 105 |
| 2021 | 357 | 253 | 100 | 4 | 0 | 42 | 126 |
| 2020 | 356 | 290 | 66 | 0 | 0 | 38 | 84 |
| 2019 | 349 | 266 | 81 | 2 | 0 | 40 | 150 |
| 2018 | 349 | 264 | 77 | 8 | 0 | 39 | 143 |
| 2017 | 359 | 284 | 71 | 4 | 0 | 40 | 133 |
| 2016 | 362 | 260 | 96 | 6 | 1 | 40 | 161 |
| 2015 | 356 | 238 | 108 | 10 | 1 | 43 | 161 |
| 2014 | 351 | 245 | 102 | 4 | 0 | 42 | 119 |
| 2013 | 363 | 236 | 124 | 3 | 0 | 44 | 119 |
| 2012 | 351 | 233 | 101 | 17 | 2 | 43 | 161 |
| 2011 | 353 | 210 | 128 | 15 | 3 | 46 | 190 |
| 2010 | 360 | 218 | 116 | 26 | 4 | 46 | 172 |
*2025 may be a partial year in EPA's file.
New Jersey compared
- Bergen County7/yr
- Mercer County6/yr
- Gloucester County6/yr
- Middlesex County5/yr
- Camden County5/yr
- Hunterdon County3/yr
- Hudson County3/yr
- Passaic County3/yr
How this is counted
A bad air day is a day the county's daily AQI from EPA AirData went above 100, the level where EPA tells children, older adults and people with asthma or heart disease to cut back outdoors. Monitors do not run every day, so yearly counts are scaled to 365 days. This is the record, not today's air: for that, check AirNow. More on the method in how the county numbers are made, on the AQI 100 line in what counts as a bad air day, and on why a purifier does not touch ozone in smoke vs ozone.