What is the air quality trend in São Tiago de Custoias?

Over the past 8 days, São Tiago de Custoias had an average AQI of 40 based on station measurements. The worst day was 2026-05-30 with AQI 54.

How is São Tiago de Custoias air quality measured?

Air quality in São Tiago de Custoias 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 Tiago de Custoias, Portugal

Name: São Tiago de Custoias 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 Tiago de Custoias, Portugal.

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

167h

PM2.5 Station

167h · 1 station

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-05-30	54	30–61	14.3 µg/m³	25.5	18h	1
2026-05-29	48	30–61	11.9 µg/m³	20.4	24h	1
2026-05-28	38	19–58	9.3 µg/m³	15.0	24h	1
2026-05-27	46	21–61	11.5 µg/m³	17.9	24h	1
2026-05-26	34	11–58	8.2 µg/m³	11.9	24h	1
2026-05-25	39	11–69	10.1 µg/m³	16.6	24h	1
2026-05-24	35	12–59	8.5 µg/m³	13.5	23h	1
2026-05-23	33	11–52	8.0 µg/m³	12.3	6h	1

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