SmogRank / Brazil / São Paulo / São Sebastião

São Sebastião, month by month

São Sebastião, São Paulo has a measured daily mean on 9 days since 3 October 2026.

Every month since 2026

2026too few days for a mean (a year needs 199)9 days measured
JanFebMarAprMayJunJulAugSepOct27#2,192
Each square is a month's mean PM2.5 in US AQI from São Sebastião's measured days, with its place on that month's world ranking under it. A month has a mean once 70% of its days are measured, the rule the monthly rankings use; under that, the square gives the days measured. Each square opens that month's ranking with São Sebastião marked; each year, the year's. A dashed square is the running month, so far.
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

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 Sebastião's worst days

DayUS AQI
10 Oct 2026 5310.0 µg/m³
11 Oct 2026 325.7 µg/m³
6 Oct 2026 285.1 µg/m³
9 Oct 2026 274.9 µg/m³
7 Oct 2026 244.4 µg/m³
4 Oct 2026 234.2 µg/m³
5 Oct 2026 224.0 µg/m³
3 Oct 2026 183.3 µg/m³
8 Oct 2026 162.8 µg/m³

Daily means, the highest since 3 Oct 2026; 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 Sebastião, São Paulo, Brazil, 3 Oct 2026 – 11 Oct 2026. Monitor data from CETESB, read from the publisher; sources listed at smogrank.com/sources. smogrank.com/br/sao-sebastiao-sao-paulo/history (accessed 12 Oct 2026).

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São Sebastião now: the last 24 hours, its ranks today and the last 12 months day by day.

Updated 2026-10-12 19:07 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).