SmogRank / Brazil / São Paulo / São Paulo
São Paulo, month by month
São Paulo has a measured daily mean on 1,381 days since 1 January 2023. Its worst month was September 2024, at 101 US AQI (35.6 µg/m³), 28th of 2,010 cities on that month's world ranking. Its cleanest was January 2026, at 45 US AQI (8.1 µg/m³). 2025 averaged 59 US AQI (13.3 µg/m³), against 66 US AQI (17.2 µg/m³) in 2024.
Every month since 2023
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
São Paulo's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| September 2024 | 10135.6 µg/m³ | 28thof 2,010 | Southern Brazil, 30 September to 4 October 2024 Southern Brazil, 22 to 28 September 2024and 2 more |
| August 2024 | 8326.5 µg/m³ | 55thof 2,010 | Southern Brazil, 30 August to 5 September 2024 Southern Brazil, 22 to 25 August 2024and 1 more |
| June 2024 | 7823.7 µg/m³ | 69thof 2,563 | Southern Brazil, 20 to 22 June 2024 Southern Brazil, 11 to 13 June 2024and 1 more |
| July 2024 | 7723.0 µg/m³ | 83rdof 2,566 | Southern Brazil, 25 to 28 July 2024 Southern Brazil, 4 to 5 July 2024 |
| June 2023 | 7220.3 µg/m³ | 264thof 1,603 | – |
| August 2023 | 7019.4 µg/m³ | 134thof 1,980 | São Paulo, Brazil, August 2023 |
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.
São Paulo's worst days
| Day | US AQI | Episode |
|---|---|---|
| 9 Sept 2024 | 16068.1 µg/m³ | Southern Brazil, 7 to 17 September 2024 |
| 11 Sept 2024 | 16068.0 µg/m³ | Southern Brazil, 7 to 17 September 2024 |
| 8 Sept 2024 | 15966.5 µg/m³ | Southern Brazil, 7 to 17 September 2024 |
| 10 Sept 2024 | 15865.3 µg/m³ | Southern Brazil, 7 to 17 September 2024 |
| 13 Sept 2024 | 15763.9 µg/m³ | Southern Brazil, 7 to 17 September 2024 |
| 12 Sept 2024 | 15459.3 µg/m³ | Southern Brazil, 7 to 17 September 2024 |
| 25 Jun 2023 | 15256.9 µg/m³ | – |
| 18 Aug 2024 | 14754.2 µg/m³ | Southern Brazil, 15 to 22 August 2024 |
| 19 Aug 2024 | 14352.6 µg/m³ | Southern Brazil, 15 to 22 August 2024 |
| 17 Aug 2024 | 14352.4 µg/m³ | Southern Brazil, 15 to 22 August 2024 |
Daily means, the highest since 1 Jan 2023; 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, São Paulo, Brazil, 1 Jan 2023 – 12 Oct 2026. Monitor data from CETESB, read from the publisher; sources listed at smogrank.com/sources. smogrank.com/br/sao-paulo/history (accessed 13 Oct 2026).
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.
São Paulo now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-13 04:07 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).