St. Petersburg Air Quality in Spring
Across 2019–2025, St. Petersburg's spring (March–May) air quality had a median AQI of 54 (Moderate) over 644 monitored days in the Tampa-St. Petersburg-Clearwater, FL area. 2.2% of spring days (14 of 644) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 55.1% of days. The cleanest spring on record here was 2022 (median AQI 54, 0 days above 100) and the worst was 2019 (median 53, 4 days above 100, peak AQI 126).
- Good: 28.0%
- Moderate: 69.9%
- Unhealthy for Sensitive Groups: 2.2%
- Unhealthy or worse: 0.0%
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How is the air in St. Petersburg in spring?
Moderate on a typical day: median AQI 54 across 2019–2025, with 2.2% of spring days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓28.0% of spring days were Good (AQI 0–50), 69.9% Moderate (51–100).
- ✓14 days of 644 reached AQI 101+; the spring peak was 143.
- ✓Cleanest month: March; worst month: April.
Frequently asked questions
What is the air quality like in St. Petersburg in spring?▾
Across 2019–2025, the median daily AQI in St. Petersburg in spring was 54 (Moderate). 28.0% of days were Good, 69.9% Moderate, and 2.2% reached Unhealthy for Sensitive Groups or worse, based on 644 monitored days in EPA's Air Quality System.
Is spring a good time for outdoor exercise in St. Petersburg?▾
A typical spring day in St. Petersburg is Moderate (median AQI 54): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 45 of spring days (2.2%) 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 spring air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 55.1% of spring days in St. Petersburg. The highest spring AQI recorded in 2019–2025 was 143 (Unhealthy for Sensitive Groups), in 2019.
St. Petersburg spring air quality, year by year
St. Petersburg spring 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 |
|---|---|---|---|---|---|
| 2019worst | 92 | 53 | 4 | 126 | O3 |
| 2020 | 92 | 53 | 2 | 112 | PM2.5 |
| 2021 | 92 | 54 | 1 | 129 | PM2.5 |
| 2022cleanest | 92 | 54 | 0 | 93 | PM2.5 |
| 2023 | 92 | 54 | 3 | 112 | PM2.5 |
| 2024 | 92 | 54 | 3 | 143 | O3 |
| 2025 | 92 | 54 | 1 | 129 | O3 |
What spring air means in St. Petersburg
A typical spring day in St. Petersburg is Moderate (median AQI 54): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 45 of spring days (2.2%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
Spring's median AQI of 54 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 Spring AQI across every EPA metro area (307,196 metro-days, 2019–2025) is 43, so St. Petersburg runs above the national Spring norm; 2.2% of its Spring days topped AQI 100 versus 0.8% nationally (above average).
Within the season, March is the cleanest month (median AQI 53, 0.5% of days above 100) and April the worst (median 54, 3.3% above 100).
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 season 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.