SmogRank / Brazil / São Paulo / São José do Rio Preto
São José do Rio Preto, month by month
São José do Rio Preto has a measured daily mean on 977 days since 1 January 2023. Its worst month was September 2024, at 131 US AQI (47.8 µg/m³), 8th of 2,010 cities on that month's world ranking. Its cleanest was January 2026, at 34 US AQI (6.1 µg/m³). 2025 averaged 59 US AQI (13.2 µg/m³), against 68 US AQI (18.3 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
14 months
| Month | Why |
|---|---|
| Oct 2025 | 7 of 31 days measured; a month needs 22. The others: 24 with no readings from the monitor. |
| Jul 2024 | 20 of 31 days measured; a month needs 22. The others: 11 with no readings from the monitor. |
| Jun 2024 | 18 of 30 days measured; a month needs 21. The others: 12 with no readings from the monitor. |
| Dec 2023 | No day measured. The others: 31 with no readings from the monitor. |
| Nov 2023 | No day measured. The others: 30 with no readings from the monitor. |
| Oct 2023 | No day measured. The others: 31 with no readings from the monitor. |
| Sep 2023 | No day measured. The others: 30 with no readings from the monitor. |
| Aug 2023 | No day measured. The others: 31 with no readings from the monitor. |
| Jul 2023 | No day measured. The others: 30 with no readings from the monitor, 1 missing from OpenAQ's archive. |
| Jun 2023 | No day measured. The others: 30 with no readings from the monitor. |
| May 2023 | No day measured. The others: 31 with no readings from the monitor. |
| Apr 2023 | 4 of 30 days measured; a month needs 21. The others: 22 with no readings from the monitor, 1 with readings for part of the day (a day needs 18 hours), 3 missing from OpenAQ's archive. |
| Mar 2023 | 11 of 31 days measured; a month needs 22. The others: 20 missing from OpenAQ's archive. |
| Feb 2023 | 3 of 28 days measured; a month needs 20. The others: 25 missing from OpenAQ's archive. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
São José do Rio Preto's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| September 2024 | 13147.8 µg/m³ | 8thof 2,010 | Southern Brazil, 30 September to 4 October 2024 Southern Brazil, 22 to 28 September 2024and 3 more |
| August 2024 | 9633.0 µg/m³ | 41stof 2,010 | Southern Brazil, 30 August to 5 September 2024 Southern Brazil, 22 to 25 August 2024and 1 more |
| September 2025 | 8125.0 µg/m³ | 136thof 3,104 | – |
| October 2024 | 7924.1 µg/m³ | 60thof 2,020 | São Paulo and Paraná, Brazil, October 2024 Southern Brazil, 30 September to 4 October 2024 |
| August 2025 | 7220.4 µg/m³ | 195thof 2,901 | – |
| August 2026 | 6818.1 µg/m³ | 287thof 2,896 | – |
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 José do Rio Preto's worst days
| Day | US AQI | Episode |
|---|---|---|
| 24 Aug 2024 | 210134.8 µg/m³ | Southern Brazil, 22 to 25 August 2024 |
| 23 Aug 2024 | 17893.8 µg/m³ | Southern Brazil, 22 to 25 August 2024 |
| 3 Oct 2024 | 17083.1 µg/m³ | Southern Brazil, 30 September to 4 October 2024 |
| 9 Sept 2024 | 16778.1 µg/m³ | Southern Brazil, 7 to 17 September 2024 |
| 27 Sept 2024 | 16271.0 µg/m³ | Southern Brazil, 22 to 28 September 2024 |
| 12 Sept 2025 | 16270.5 µg/m³ | – |
| 4 Sept 2024 | 15967.1 µg/m³ | Southern Brazil, 30 August to 5 September 2024 |
| 10 Sept 2024 | 15966.8 µg/m³ | Southern Brazil, 7 to 17 September 2024 |
| 22 Aug 2024 | 15966.3 µg/m³ | Southern Brazil, 22 to 25 August 2024 Southern Brazil, 15 to 22 August 2024 |
| 3 Sept 2024 | 15764.3 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, São José do Rio Preto, Brazil, 1 Jan 2023 – 11 Oct 2026. Monitor data from CETESB, read from the publisher; sources listed at smogrank.com/sources. smogrank.com/br/sao-jose-do-rio-preto/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 José do Rio Preto now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-13 02:07 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).