Irvine Air Quality in 2025
In 2025, Irvine's air quality (Los Angeles-Long Beach-Anaheim, CA area) had a median daily AQI of 74 (Moderate) across 365 monitored days. 99 days (27.1%) reached Unhealthy for Sensitive Groups or worse, 39 were Good, and the year's peak AQI was 201 (Very Unhealthy). Ground-level ozone set the daily AQI on 193 of those days. The cleanest month of 2025 was March (median AQI 56, 0 days above 100) and the worst was August (median 129, 24 days above 100, peak 185).
- Good: 10.7%
- Moderate: 62.2%
- Unhealthy for Sensitive Groups: 18.4%
- Unhealthy or worse: 8.8%
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How was Irvine's air quality in 2025?
Moderate on a typical day: median AQI 74, with 99 days above AQI 100 out of 365 monitored — the 5th cleanest of 7 years on record for the area.
- ✓Peak AQI in 2025: 201 (Very Unhealthy).
- ✓Ground-level ozone was the main pollutant on 193 days.
- ✓Cleanest month: March; worst: August.
Frequently asked questions
What was the average AQI in Irvine in 2025?▾
EPA's Air Quality System puts Irvine's (Los Angeles-Long Beach-Anaheim, CA) median daily AQI for 2025 at 74, which is Moderate. 99 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 201.
Which month had the worst air quality in Irvine in 2025?▾
The cleanest month of 2025 was March (median AQI 56, 0 days above 100) and the worst was August (median 129, 24 days above 100, peak 185).
Was 2025 a good or bad year for Irvine's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2025 ranks 5th cleanest by days above AQI 100. 2025's median of 74 is in line with the area's typical annual median of 74.
Irvine month by month in 2025
Irvine air quality month by month, 2025 (Los Angeles-Long Beach-Anaheim, CA, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 31 | 71 | 7 | 182 | PM2.5 |
| February | 28 | 63 | 1 | 103 | PM2.5 |
| Marchcleanest | 31 | 56 | 0 | 93 | PM2.5 |
| April | 30 | 67 | 4 | 136 | O3 |
| May | 31 | 74 | 12 | 159 | O3 |
| June | 30 | 119 | 17 | 201 | O3 |
| July | 31 | 105 | 17 | 177 | O3 |
| Augustworst | 31 | 129 | 24 | 185 | O3 |
| September | 30 | 66 | 7 | 182 | O3 |
| October | 31 | 69 | 0 | 100 | O3 |
| November | 30 | 65 | 2 | 115 | PM2.5 |
| December | 31 | 80 | 8 | 152 | PM2.5 |
How 2025 compares
Among the 7 years EPA has published for the area (2019–2025), 2025 ranks 5th cleanest by days above AQI 100.
2025's median of 74 is in line with the area's typical annual median of 74.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Irvine
The latest EPA AirNow observation puts Irvine's AQI at 48 (PM2.5). The figures above are multi-year annual statistics, not today's reading.
View current Irvine air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Los Angeles-Long Beach-Anaheim, CA), 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.