Bad Air Days in Darlington County, South Carolina: 0 a Year
0 bad air days a year
Rare: among the cleanest-air counties EPA monitors. Ranked 982 of 996 monitored counties, where 1 is worst.
Is a purifier worth it here?
- Bad air days are rare here. A standard furnace filter is enough; no purifier needed for outdoor air.
- On the odd bad day, check AirNow and keep windows shut.
Better or worse than it was
In 2000 to 2009 this county averaged 18 bad days a year; in 2016 to 2025, 0. The air has improved.
| Date | AQI | Main pollutant |
|---|---|---|
| 2024-03-14 | 100 | Ozone |
| 2024-04-16 | 97 | Ozone |
| 2025-02-27 | 97 | Ozone |
| 2023-06-10 | 93 | Ozone |
| 2019-10-03 | 90 | Ozone |
The air on a normal day
Across 2,358 monitored days from 2016 to 2025, the air in Darlington County rated Good on 92% of them, more often than the 72% typical of monitored counties, and Moderate on 8%. The median day sat at AQI 38; one day in ten went above 49.
The pollutant setting the AQI on an ordinary day here:
- ozone100%2,358 days
Year by year
| Year | Days monitored | Good | Moderate | Over 100 | Over 150 | Median AQI | Highest AQI |
|---|---|---|---|---|---|---|---|
| 2025* | 254 | 226 | 28 | 0 | 0 | 40 | 97 |
| 2024 | 261 | 224 | 37 | 0 | 0 | 40 | 100 |
| 2023 | 271 | 238 | 33 | 0 | 0 | 40 | 93 |
| 2022 | 265 | 249 | 16 | 0 | 0 | 36 | 84 |
| 2021 | 275 | 257 | 18 | 0 | 0 | 35 | 74 |
| 2020 | 253 | 253 | 0 | 0 | 0 | 32 | 49 |
| 2019 | 122 | 110 | 12 | 0 | 0 | 38 | 90 |
| 2018 | 142 | 133 | 9 | 0 | 0 | 40 | 87 |
| 2017 | 274 | 254 | 20 | 0 | 0 | 39 | 77 |
| 2016 | 241 | 220 | 21 | 0 | 0 | 39 | 87 |
| 2015 | 244 | 229 | 15 | 0 | 0 | 40 | 84 |
| 2014 | 230 | 196 | 34 | 0 | 0 | 41 | 97 |
| 2013 | 227 | 216 | 11 | 0 | 0 | 36 | 93 |
| 2012 | 242 | 209 | 30 | 3 | 0 | 39 | 147 |
| 2011 | 259 | 172 | 84 | 3 | 0 | 44 | 122 |
| 2010 | 321 | 259 | 58 | 4 | 0 | 41 | 112 |
*2025 may be a partial year in EPA's file.
Nearby counties on file
- Cherokee Countythin data
- York County2/yr
- Spartanburg County2/yr
- Richland County1/yr
- Colleton County1/yr
- Greenville County1/yr
- Charleston Countyunder 1/yr
- Chesterfield Countyunder 1/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.