SmogRank / Brazil / São Paulo / Bauru
Bauru, month by month
Bauru has a measured daily mean on 697 days since 11 September 2024. Its worst month was September 2025, at 66 US AQI (17.2 µg/m³), 285th of 3,104 cities on that month's world ranking. Its cleanest was December 2024, at 38 US AQI (6.9 µg/m³).
Every month since 2024
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
Months without a mean, and why
3 months
| Month | Why |
|---|---|
| Jan 2026 | 16 of 31 days measured; a month needs 22. The others: 14 with no readings from the monitor, 1 with readings for part of the day (a day needs 18 hours). |
| Dec 2025 | No day measured. The others: 30 with no readings from the monitor, 1 with readings for part of the day (a day needs 18 hours). |
| Sep 2024 | 20 of 30 days measured; a month needs 21. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Bauru's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| September 2025 | 6617.2 µg/m³ | 285thof 3,104 | – |
| October 2024 | 6215.2 µg/m³ | 247thof 2,020 | São Paulo and Paraná, Brazil, October 2024 Southern Brazil, 30 September to 4 October 2024 |
| August 2025 | 6215.1 µg/m³ | 346thof 2,901 | – |
| August 2026 | 6215.1 µg/m³ | 384thof 2,896 | – |
| July 2026 | 6013.8 µg/m³ | 620thof 2,784 | – |
| July 2025 | 5913.4 µg/m³ | 571stof 2,889 | – |
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.
Bauru's worst days
| Day | US AQI | Episode |
|---|---|---|
| 26 Sept 2024 | 15358.2 µg/m³ | Southern Brazil, 22 to 28 September 2024 |
| 11 Sept 2024 | 15155.9 µg/m³ | Southern Brazil, 7 to 17 September 2024 |
| 12 Sept 2024 | 15055.3 µg/m³ | Southern Brazil, 7 to 17 September 2024 |
| 2 Oct 2024 | 14754.2 µg/m³ | Southern Brazil, 30 September to 4 October 2024 |
| 13 Sept 2024 | 12846.3 µg/m³ | Southern Brazil, 7 to 17 September 2024 |
| 25 Sept 2024 | 12545.2 µg/m³ | Southern Brazil, 22 to 28 September 2024 |
| 14 Sept 2024 | 11240.1 µg/m³ | Southern Brazil, 7 to 17 September 2024 |
| 30 Sept 2025 | 11239.9 µg/m³ | – |
| 23 Sept 2024 | 10838.4 µg/m³ | Southern Brazil, 22 to 28 September 2024 |
| 1 Oct 2024 | 10737.8 µg/m³ | Southern Brazil, 30 September to 4 October 2024 |
Daily means, the highest since 11 Sept 2024; 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, Bauru, Brazil, 11 Sep 2024 – 11 Oct 2026. Monitor data from CETESB, read from the publisher; sources listed at smogrank.com/sources. smogrank.com/br/bauru/history (accessed 12 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.
Bauru now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 23:07 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).