Corona, California Air Quality
Corona air quality today — the AQI, the main pollutant, and whether it’s safe to exercise outside right now
Corona, CA · Air quality right now
The air quality index in Corona, CA is 61 (Moderate) right now — acceptable for most people.
Is it safe to be outside in Corona today?
AQI 61 Yes — air quality is Moderate
Fine for most; unusually sensitive people can take it easy.Main pollutant: PM2.5Observed 8:00 AM PDT
Pollutants right now
- PM2.525 µg/m³Main pollutantfine particles — smoke, exhaust, soot
- PM1028 µg/m³coarse particles — dust, pollen, ash
- Ozone20 µg/m³smog — builds on hot, sunny days
- NO₂37 µg/m³nitrogen dioxide — traffic, combustion
ExerciseOK to run for most; sensitive athletes can ease the intensity.
How to read Corona’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 Corona
Across the EPA’s county records from 2020 to 2025, Corona’s cleanest year was 2022 (median AQI 77) and its most polluted was 2021 (median AQI 89); the typical (median) day has trended cleaner since 2020.
| Year | Median AQI | Unhealthy+ | Main pollutant | USG | Moderate | Good |
|---|---|---|---|---|---|---|
| 2020 | 87 | 47 | Ozone | 98 | 179 | 42 |
| 2021 | 89 | 47 | Ozone | 89 | 210 | 19 |
| 2022 | 77 | 40 | Ozone | 86 | 198 | 41 |
| 2023 | 77 | 41 | Ozone | 73 | 189 | 62 |
| 2024 | 87 | 67 | Ozone | 80 | 176 | 43 |
| 2025 | 80 | 34 | Ozone | 75 | 217 | 39 |
“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, 2020–2025.
Frequently asked
- What was the worst year for air quality in Corona?
- In the EPA's 2020–2025 county records, 2024 had the most days above AQI 100: 147 days (80 Unhealthy for Sensitive Groups, 67 Unhealthy or worse). The highest median AQI came in 2021 (89; 2024's was 87).
- How many unhealthy air days does Corona have?
- Across 2020–2025, 35% of the days reported for Corona's county had an AQI above 100 (777 of 2192), about 130 days a year. 2025 had 109 days.
- What's the main air pollutant in Corona?
- Ozone: it drove Corona's county AQI on the most days in every year of the EPA's 2020–2025 records.