SmogRank / Brazil / São Paulo / Ferraz de Vasconcelos
Ferraz de Vasconcelos, month by month
Ferraz de Vasconcelos has a measured daily mean on 1,271 days since 1 January 2023. Its worst month was September 2024, at 98 US AQI (34.5 µg/m³), 34th of 2,010 cities on that month's world ranking. Its cleanest was February 2026, at 48 US AQI (8.7 µg/m³). 2025 averaged 60 US AQI (14.0 µg/m³), against 67 US AQI (17.9 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
Months without a mean, and why
3 months
| Month | Why |
|---|---|
| Mar 2023 | 11 of 31 days measured; a month needs 22. The others: 20 missing from OpenAQ's archive. |
| Feb 2023 | 2 of 28 days measured; a month needs 20. The others: 1 with no readings from the monitor, 25 missing from OpenAQ's archive. |
| Jan 2023 | 18 of 31 days measured; a month needs 22. The others: 6 with no readings from the monitor, 1 with readings for part of the day (a day needs 18 hours), 6 missing from OpenAQ's archive. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Ferraz de Vasconcelos's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| September 2024 | 9834.5 µg/m³ | 34thof 2,010 | Southern Brazil, 30 September to 4 October 2024 Southern Brazil, 22 to 28 September 2024and 2 more |
| August 2024 | 8829.0 µg/m³ | 49thof 2,010 | Southern Brazil, 30 August to 5 September 2024 Southern Brazil, 22 to 25 August 2024and 1 more |
| June 2024 | 8628.1 µg/m³ | 46thof 2,563 | Southern Brazil, 20 to 22 June 2024 Southern Brazil, 11 to 13 June 2024and 1 more |
| July 2024 | 8024.8 µg/m³ | 74thof 2,566 | Southern Brazil, 25 to 28 July 2024 Southern Brazil, 4 to 5 July 2024 |
| August 2023 | 7622.6 µg/m³ | 100thof 1,980 | São Paulo, Brazil, August 2023 |
| June 2023 | 7522.0 µg/m³ | 236thof 1,603 | – |
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.
Ferraz de Vasconcelos's worst days
| Day | US AQI | Episode |
|---|---|---|
| 11 Sept 2024 | 16373.2 µg/m³ | Southern Brazil, 7 to 17 September 2024 |
| 9 Sept 2024 | 16373.0 µg/m³ | Southern Brazil, 7 to 17 September 2024 |
| 10 Sept 2024 | 16170.0 µg/m³ | Southern Brazil, 7 to 17 September 2024 |
| 8 Sept 2024 | 15763.6 µg/m³ | Southern Brazil, 7 to 17 September 2024 |
| 20 Aug 2024 | 15663.3 µg/m³ | Southern Brazil, 15 to 22 August 2024 |
| 17 Aug 2024 | 15561.9 µg/m³ | Southern Brazil, 15 to 22 August 2024 |
| 18 Aug 2024 | 15561.4 µg/m³ | Southern Brazil, 15 to 22 August 2024 |
| 19 Aug 2024 | 15459.8 µg/m³ | Southern Brazil, 15 to 22 August 2024 |
| 12 Sept 2024 | 15357.8 µg/m³ | Southern Brazil, 7 to 17 September 2024 |
| 4 Sept 2024 | 15257.2 µg/m³ | Southern Brazil, 30 August to 5 September 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, Ferraz de Vasconcelos, Brazil, 1 Jan 2023 – 11 Oct 2026. Monitor data from CETESB, read from the publisher; sources listed at smogrank.com/sources. smogrank.com/br/ferraz-de-vasconcelos/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.
Ferraz de Vasconcelos now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 20:07 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).