Irvine Air Quality in March
Across 2019–2025, Irvine's March air quality had a median AQI of 55 (Moderate) over 217 monitored days in the Los Angeles-Long Beach-Anaheim, CA area. 0.5% of March days (1 of 217) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 63.6% of days. The cleanest March on record here was 2020 (median AQI 47, 0 days above 100) and the worst was 2019 (median 57, 1 day above 100, peak AQI 108).
- Good: 30.9%
- Moderate: 68.7%
- Unhealthy for Sensitive Groups: 0.5%
- Unhealthy or worse: 0.0%
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How is the air in Irvine in March?
Moderate on a typical day: median AQI 55 across 2019–2025, with 0.5% of March days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓30.9% of March days were Good (AQI 0–50), 68.7% Moderate (51–100).
- ✓1 day of 217 reached AQI 101+; the March peak was 108.
- ✓Best March: 2020; worst March: 2019.
Frequently asked questions
What is the air quality like in Irvine in March?▾
Across 2019–2025, the median daily AQI in Irvine in March was 55 (Moderate). 30.9% of days were Good, 68.7% Moderate, and 0.5% reached Unhealthy for Sensitive Groups or worse, based on 217 monitored days in EPA's Air Quality System.
Is March a good time for outdoor exercise in Irvine?▾
A typical March day in Irvine is Moderate (median AQI 55): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and fewer than 1% of March days 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 March air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 63.6% of March days in Irvine. The highest March AQI recorded in 2019–2025 was 108 (Unhealthy for Sensitive Groups), in 2019.
Irvine March air quality, year by year
Irvine March 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 |
|---|---|---|---|---|---|
| 2019worst | 31 | 57 | 1 | 108 | PM2.5 |
| 2020cleanest | 31 | 47 | 0 | 75 | PM2.5 |
| 2021 | 31 | 57 | 0 | 80 | PM2.5 |
| 2022 | 31 | 62 | 0 | 87 | PM2.5 |
| 2023 | 31 | 55 | 0 | 64 | PM2.5 |
| 2024 | 31 | 48 | 0 | 84 | PM2.5 |
| 2025 | 31 | 56 | 0 | 93 | PM2.5 |
What March air means in Irvine
A typical March day in Irvine is Moderate (median AQI 55): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and fewer than 1% of March days reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
March's median AQI of 55 is below Irvine's whole-year median of 74, making it one of the area's cleaner periods. Nationally, the median March AQI across every EPA metro area (102,455 metro-days, 2019–2025) is 42, so Irvine runs above the national March norm; 0.5% of its March days topped AQI 100 versus 0.4% nationally (about the same).
March 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.