What is the air quality trend in São Caetano do Sul?

Over the past 15 days, São Caetano do Sul had an average AQI of 51 based on station measurements. The worst day was 2026-10-18 with AQI 84.

How is São Caetano do Sul air quality measured?

Air quality in São Caetano do Sul is measured by ground-level monitoring stations that report PM2.5 and PM10 concentrations hourly. CERNS.IO aggregates readings from nearby stations and converts PM2.5 to the US EPA Air Quality Index (AQI) scale.

Air Quality History for São Caetano do Sul, Brazil

Name: São Caetano do Sul Air Quality History
Creator: CERNS.IO
License: https://creativecommons.org/licenses/by/4.0/

Historical PM2.5 and AQI trend from monitoring stations near São Caetano do Sul, Brazil.

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

334h

PM2.5 Station

334h · 2 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-10-22	58	58–58	15.7 µg/m³	16.6	1h	2
2026-10-21	59	15–94	17.6 µg/m³	19.6	24h	2
2026-10-20	62	17–98	18.5 µg/m³	20.6	24h	2
2026-10-19	60	38–93	17.2 µg/m³	18.8	24h	2
2026-10-18	84	8–155	29.5 µg/m³	36.6	24h	2
2026-10-17	29	1–90	7.5 µg/m³	8.5	23h	2
2026-10-16	43	6–135	14.0 µg/m³	17.5	24h	3
2026-10-15	40	10–97	10.8 µg/m³	12.0	24h	2
2026-10-14	28	7–61	6.8 µg/m³	7.7	24h	2
2026-10-13	33	1–72	8.8 µg/m³	10.0	24h	2
2026-10-12	41	7–69	11.0 µg/m³	12.1	24h	2
2026-10-11	42	6–96	11.6 µg/m³	12.6	24h	2
2026-10-10	44	15–79	11.8 µg/m³	13.0	24h	2
2026-10-09	78	10–168	26.5 µg/m³	30.7	24h	2
2026-10-08	64	21–96	19.2 µg/m³	21.8	22h	2

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