Antioch, California Air Quality
Antioch air quality today — the AQI, the main pollutant, and whether it’s safe to exercise outside right now
Antioch, CA · Air quality right now
The air quality index in Antioch, CA is 52 (Moderate) right now — acceptable for most people.
Is it safe to be outside in Antioch today?
AQI 52 Yes — air quality is Moderate
Fine for most; unusually sensitive people can take it easy.Main pollutant: PM2.5Observed 1:00 AM PDT
Pollutants right now
- PM2.58.1 µg/m³Main pollutantfine particles — smoke, exhaust, soot
- PM1013 µg/m³coarse particles — dust, pollen, ash
- Ozone42 µg/m³smog — builds on hot, sunny days
- NO₂13 µg/m³nitrogen dioxide — traffic, combustion
ExerciseOK to run for most; sensitive athletes can ease the intensity.
How to read Antioch’s air quality
Guides: The AQI Scale, Explained · Air Quality Alerts, Decoded · How to Read a Wildfire Smoke Map · Why Wildfire Smoke Travels 1,000 Miles.
Air quality over time in Antioch
Across the EPA’s county records from 2020 to 2024, Antioch’s cleanest year was 2021 (median AQI 47) and its most polluted was 2022 (median AQI 51); the typical (median) day has held roughly steady since 2020.
| Year | Median AQI | Unhealthy+ | Main pollutant | USG | Moderate | Good |
|---|---|---|---|---|---|---|
| 2020 | 49 | 11 | PM2.5 | 7 | 156 | 192 |
| 2021 | 47 | 0 | PM2.5 | 5 | 165 | 195 |
| 2022 | 51 | 0 | PM2.5 | 2 | 188 | 175 |
| 2023 | 51 | 0 | PM2.5 | 2 | 190 | 173 |
| 2024 | 48 | 0 | PM2.5 | 0 | 168 | 195 |
“USG” is Unhealthy for Sensitive Groups (AQI 101–150); “Unhealthy+” combines the Unhealthy, Very Unhealthy, and Hazardous days. In 2024 the EPA tightened the annual fine-particle (PM2.5) standard to 9 µg/m³ from the previous 12 µg/m³, so counties near the old limit read worse against the new one. Source: EPA AQS annual summaries, 2020–2024.
Frequently asked
- What was the worst year for air quality in Antioch?
- In the EPA's 2020–2024 county records, 2020 had the most days above AQI 100: 18 days (7 Unhealthy for Sensitive Groups, 11 Unhealthy or worse). The highest median AQI came in 2022 (51; 2020's was 49).
- How many unhealthy air days does Antioch have?
- Across 2020–2024, 1% of the days reported for Antioch's county had an AQI above 100 (27 of 1824), about 5 days a year. 2024 had 0 days.
- What's the main air pollutant in Antioch?
- PM2.5: it drove Antioch's county AQI on the most days in every year of the EPA's 2020–2024 records.