Fresno Air Quality in March
Across 2019–2025, Fresno's March air quality had a median AQI of 45 (Good) over 217 monitored days in the Fresno, CA area. 0.0% of March days (0 of 217) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 51.2% of days. The cleanest March on record here was 2020 (median AQI 42, 0 days above 100) and the worst was 2022 (median 55, 0 days above 100, peak AQI 84).
- Good: 60.8%
- Moderate: 39.2%
- Unhealthy for Sensitive Groups: 0.0%
- Unhealthy or worse: 0.0%
Reduce Indoor Ozone in Fresno
Today's main pollutant in Fresno is ground-level ozone (AQI 93). Important: standard HEPA filters do NOT remove ozone — only a purifier with a substantial activated-carbon bed adsorbs it. The biggest wins are cutting indoor sources (gas appliances, certain "ionizer" purifiers) and ventilating when outdoor ozone is low (early morning). A high-carbon unit helps with the gases and VOCs that linger indoors.
Recommended: Levoit Core 300 — True HEPA + activated carbon · CADR ~141 CFM · rooms up to 219 sq ft
As an Amazon Associate, we earn from qualifying purchases.
How is the air in Fresno in March?
Good on a typical day: median AQI 45 across 2019–2025, with 0.0% of March days above AQI 100. Ground-level ozone is the main driver.
- ✓60.8% of March days were Good (AQI 0–50), 39.2% Moderate (51–100).
- ✓0 days of 217 reached AQI 101+; the March peak was 84.
- ✓Best March: 2020; worst March: 2022.
Frequently asked questions
What is the air quality like in Fresno in March?▾
Across 2019–2025, the median daily AQI in Fresno in March was 45 (Good). 60.8% of days were Good, 39.2% Moderate, and 0.0% 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 Fresno?▾
A typical March day in Fresno sits in the Good range (median AQI 45), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of March days reached AQI 101+ in 2019–2025.
Which pollutant causes Fresno's March air quality problems?▾
Ground-level ozone set the daily AQI on 51.2% of March days in Fresno. The highest March AQI recorded in 2019–2025 was 84 (Moderate), in 2022.
Fresno March air quality, year by year
Fresno March air quality by year (Fresno, CA, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 31 | 44 | 0 | 58 | O3 |
| 2020cleanest | 31 | 42 | 0 | 72 | O3 |
| 2021 | 31 | 54 | 0 | 73 | PM2.5 |
| 2022worst | 31 | 55 | 0 | 84 | PM2.5 |
| 2023 | 31 | 43 | 0 | 64 | O3 |
| 2024 | 31 | 43 | 0 | 60 | O3 |
| 2025 | 31 | 44 | 0 | 58 | O3 |
What March air means in Fresno
A typical March day in Fresno sits in the Good range (median AQI 45), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of March days reached AQI 101+ in 2019–2025.
March's median AQI of 45 is below Fresno's whole-year median of 67, 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 Fresno runs in line with the national March norm; 0.0% of its March days topped AQI 100 versus 0.4% nationally (about the same).
March is part of Fresno's spring season (March, April, May); the spring page pools all three months.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Fresno
The latest EPA AirNow observation puts Fresno's AQI at 93 (O3). The figures above are multi-year month statistics, not today's reading.
View current Fresno air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Fresno, 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.