St. Petersburg Air Quality in March
Across 2019–2025, St. Petersburg's March air quality had a median AQI of 53 (Moderate) over 217 monitored days in the Tampa-St. Petersburg-Clearwater, FL 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 64.1% of days. The cleanest March on record here was 2021 (median AQI 51, 0 days above 100) and the worst was 2023 (median 55, 1 day above 100, peak AQI 105).
- Good: 32.7%
- Moderate: 66.8%
- Unhealthy for Sensitive Groups: 0.5%
- Unhealthy or worse: 0.0%
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How is the air in St. Petersburg in March?
Moderate on a typical day: median AQI 53 across 2019–2025, with 0.5% of March days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓32.7% of March days were Good (AQI 0–50), 66.8% Moderate (51–100).
- ✓1 day of 217 reached AQI 101+; the March peak was 105.
- ✓Best March: 2021; worst March: 2023.
Frequently asked questions
What is the air quality like in St. Petersburg in March?▾
Across 2019–2025, the median daily AQI in St. Petersburg in March was 53 (Moderate). 32.7% of days were Good, 66.8% 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 St. Petersburg?▾
A typical March day in St. Petersburg is Moderate (median AQI 53): 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 St. Petersburg's March air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 64.1% of March days in St. Petersburg. The highest March AQI recorded in 2019–2025 was 105 (Unhealthy for Sensitive Groups), in 2023.
St. Petersburg March air quality, year by year
St. Petersburg March air quality by year (Tampa-St. Petersburg-Clearwater, FL, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 31 | 52 | 0 | 100 | PM2.5 |
| 2020 | 31 | 52 | 0 | 65 | PM2.5 |
| 2021cleanest | 31 | 51 | 0 | 67 | PM2.5 |
| 2022 | 31 | 56 | 0 | 93 | PM2.5 |
| 2023worst | 31 | 55 | 1 | 105 | PM2.5 |
| 2024 | 31 | 52 | 0 | 90 | PM2.5 |
| 2025 | 31 | 55 | 0 | 87 | PM2.5 |
What March air means in St. Petersburg
A typical March day in St. Petersburg is Moderate (median AQI 53): 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 53 is in line with St. Petersburg's whole-year median of 51, so this period is neither a clean nor a dirty stretch for the area. Nationally, the median March AQI across every EPA metro area (102,455 metro-days, 2019–2025) is 42, so St. Petersburg 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 St. Petersburg's spring season (March, April, May); the spring page pools all three months.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in St. Petersburg
The latest EPA AirNow observation puts St. Petersburg's AQI at 38 (PM2.5). The figures above are multi-year month statistics, not today's reading.
View current St. Petersburg air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Tampa-St. Petersburg-Clearwater, FL), 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.