SmogRank / United States / Florida / St. Petersburg

St. Petersburg, month by month

St. Petersburg, Florida has a measured daily mean on 588 days since 7 February 2025. Its worst month was March 2025, at 49 US AQI (8.9 µg/m³), 1,796th of 2,862 cities on that month's world ranking. Its cleanest was September 2026, at 24 US AQI (4.4 µg/m³).

Every month since 2025

202638 so far276 days measured2,255th of 2,793 in the world
Jan44#1,526Feb43#2,022Mar44#2,171Apr38#1,950May37#1,737Jun37#1,640Jul48#1,689Aug36#2,334Sep24#2,597Oct26#2,314
202539 for the year312 days measured2,057th of 2,681 in the world
JanFeb43#1,643Mar49#1,796Apr47#1,623May39#1,581Jun42#1,920Jul41#1,907Aug34#2,476Sep28#2,552Oct31#1,821Nov42#1,656Dec40#2,090
Each square is a month's mean PM2.5 in US AQI from St. Petersburg's measured days, with its place on that month's world ranking under it. A month has a mean once 70% of its days are measured, the rule the monthly rankings use; under that, the square gives the days measured. Each square opens that month's ranking with St. Petersburg marked; each year, the year's. A dashed square is the running month, so far.
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

St. Petersburg's worst months

MonthUS AQIDays measuredWorld rank
March 2025 498.9 µg/m³28 of 311,796thof 2,862
July 2026 488.7 µg/m³31 of 311,689thof 2,784
April 2025 478.5 µg/m³30 of 301,623rdof 2,951
January 2026 447.9 µg/m³30 of 311,526thof 2,617
March 2026 447.9 µg/m³29 of 312,171stof 2,971
February 2025 437.8 µg/m³21 of 281,643rdof 2,633

Monthly means over the days measured; finished months only. World rank: its place on that month's world ranking of every city with enough days. Each month opens that ranking.

St. Petersburg's worst days

DayUS AQI
1 Jan 2026 8728.2 µg/m³
21 Mar 2026 6717.7 µg/m³
5 Jun 2025 6516.7 µg/m³
8 Mar 2025 6416.2 µg/m³
31 Dec 2025 6416.1 µg/m³
22 Mar 2026 6215.1 µg/m³
8 Jun 2025 6114.3 µg/m³
3 Feb 2026 6014.1 µg/m³
13 Jun 2025 6014.0 µg/m³
20 Apr 2026 6014.0 µg/m³

Daily means, the highest since 7 Feb 2025; the WHO's daily guideline is 15 µg/m³. Each date opens that day's world ranking, and each episode the bad-air spell it was part of.

Use this history

SmogRank, PM2.5 monthly and daily means, St. Petersburg, Florida, United States, 7 Feb 2025 – 11 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/st-petersburg/history (accessed 12 Oct 2026).

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You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.

St. Petersburg now: the last 24 hours, its ranks today and the last 12 months day by day.

Updated 2026-10-12 21:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index. Some low-cost readings: Sensor.Community, ODbL (data and licence). Some readings: Uzhydromet (Uzbekistan's Hydrometeorological Service); Department of Environment, Nepal; Vietnam's government monitors; Aurassure; Umhverfisstofnun (Environment Agency of Iceland); RMCAB (Secretaría Distrital de Ambiente, Bogotá); Love My Air (City and County of Denver), no reuse terms published (why we use them).