Irvine Air Quality in April
Across 2019–2025, Irvine's April air quality had a median AQI of 67 (Moderate) over 210 monitored days in the Los Angeles-Long Beach-Anaheim, CA area. 15.7% of April days (33 of 210) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 59.5% of days. The cleanest April on record here was 2024 (median AQI 61, 3 days above 100) and the worst was 2020 (median 56, 8 days above 100, peak AQI 185).
- Good: 14.3%
- Moderate: 70.0%
- Unhealthy for Sensitive Groups: 13.3%
- Unhealthy or worse: 2.4%
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How is the air in Irvine in April?
Moderate on a typical day: median AQI 67 across 2019–2025, with 15.7% of April days above AQI 100. Ground-level ozone is the main driver.
- ✓14.3% of April days were Good (AQI 0–50), 70.0% Moderate (51–100).
- ✓33 days of 210 reached AQI 101+; the April peak was 185.
- ✓Best April: 2024; worst April: 2020.
Frequently asked questions
What is the air quality like in Irvine in April?▾
Across 2019–2025, the median daily AQI in Irvine in April was 67 (Moderate). 14.3% of days were Good, 70.0% Moderate, and 15.7% reached Unhealthy for Sensitive Groups or worse, based on 210 monitored days in EPA's Air Quality System.
Is April a good time for outdoor exercise in Irvine?▾
A typical April day in Irvine is Moderate (median AQI 67): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 6 of April days (15.7%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
Which pollutant causes Irvine's April air quality problems?▾
Ground-level ozone set the daily AQI on 59.5% of April days in Irvine. The highest April AQI recorded in 2019–2025 was 185 (Unhealthy), in 2020.
Irvine April air quality, year by year
Irvine April air quality by year (Los Angeles-Long Beach-Anaheim, CA, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 30 | 66 | 3 | 115 | O3 |
| 2020worst | 30 | 56 | 8 | 185 | O3 |
| 2021 | 30 | 71 | 4 | 133 | O3 |
| 2022 | 30 | 67 | 4 | 129 | O3 |
| 2023 | 30 | 73 | 7 | 156 | O3 |
| 2024cleanest | 30 | 61 | 3 | 140 | O3 |
| 2025 | 30 | 67 | 4 | 136 | O3 |
What April air means in Irvine
A typical April day in Irvine is Moderate (median AQI 67): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 6 of April days (15.7%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
April's median AQI of 67 is below Irvine's whole-year median of 74, making it one of the area's cleaner periods. Nationally, the median April AQI across every EPA metro area (100,677 metro-days, 2019–2025) is 44, so Irvine runs above the national April norm; 15.7% of its April days topped AQI 100 versus 0.7% nationally (above average).
April is part of Irvine's spring season (March, April, May); the spring page pools all three months.
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 month 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.