SmogRank / Brazil / São Paulo / Cubatão
Cubatão, month by month
Cubatão has a measured daily mean on 592 days since 29 October 2024. Its worst month was July 2025, at 58 US AQI (12.9 µg/m³), 662nd of 2,889 cities on that month's world ranking. Its cleanest was February 2026, at 33 US AQI (5.9 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
6 months
| Month | Why |
|---|---|
| Oct 2026 | 3 of 11 days measured; a month needs 8. The others: 6 with no readings from the monitor, 2 with readings for part of the day (a day needs 18 hours). |
| Mar 2025 | 19 of 31 days measured; a month needs 22. The others: 6 with no readings from the monitor, 6 with readings for part of the day (a day needs 18 hours). |
| Feb 2025 | 17 of 28 days measured; a month needs 20. The others: 6 with no readings from the monitor, 5 with readings for part of the day (a day needs 18 hours). |
| Jan 2025 | 12 of 31 days measured; a month needs 22. The others: 16 with no readings from the monitor, 3 with readings for part of the day (a day needs 18 hours). |
| Dec 2024 | 19 of 31 days measured; a month needs 22. The others: 9 with no readings from the monitor, 3 with readings for part of the day (a day needs 18 hours). |
| Oct 2024 | 3 of 31 days measured; a month needs 22. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Cubatão's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| July 2025 | 5812.9 µg/m³ | 662ndof 2,889 | – |
| August 2026 | 5712.2 µg/m³ | 544thof 2,896 | – |
| June 2025 | 5712.1 µg/m³ | 792ndof 2,508 | – |
| May 2025 | 5611.6 µg/m³ | 623rdof 2,826 | – |
| May 2026 | 5511.1 µg/m³ | 644thof 2,874 | São Paulo and Rio de Janeiro, Brazil, May 2026 |
| April 2025 | 5410.9 µg/m³ | 957thof 2,951 | – |
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.
Cubatão's worst days
| Day | US AQI | Episode |
|---|---|---|
| 26 Sept 2026 | 10235.8 µg/m³ | – |
| 15 May 2026 | 8225.8 µg/m³ | São Paulo and Rio de Janeiro, Brazil, May 2026 |
| 27 Jul 2025 | 8125.2 µg/m³ | – |
| 6 May 2026 | 8125.0 µg/m³ | – |
| 22 Aug 2025 | 8024.6 µg/m³ | – |
| 5 Aug 2026 | 7924.2 µg/m³ | – |
| 4 Aug 2026 | 7924.1 µg/m³ | – |
| 3 Aug 2026 | 7924.0 µg/m³ | – |
| 27 Jul 2026 | 7722.9 µg/m³ | – |
| 20 Jun 2025 | 7722.8 µg/m³ | – |
Daily means, the highest since 29 Oct 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, Cubatão, Brazil, 29 Oct 2024 – 4 Oct 2026. Monitor data from CETESB, read from the publisher; sources listed at smogrank.com/sources. smogrank.com/br/cubatao/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.
Cubatão 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).