What is the air quality trend in São Martinho?

Over the past 8 days, São Martinho had an average AQI of 34 based on station measurements. The worst day was 2026-05-26 with AQI 40.

How is São Martinho air quality measured?

Air quality in São Martinho 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 Martinho, Portugal

Name: São Martinho 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 Martinho, Portugal.

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

146h

PM2.5 Station

146h · 2 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-05-30	31	12–81	7.9 µg/m³	15h	2
2026-05-29	28	1–46	6.7 µg/m³	21h	2
2026-05-28	32	3–51	7.6 µg/m³	21h	2
2026-05-27	34	6–55	8.2 µg/m³	20h	2
2026-05-26	40	19–61	9.8 µg/m³	23h	2
2026-05-25	38	15–80	9.6 µg/m³	19h	2
2026-05-24	37	15–76	9.0 µg/m³	23h	2
2026-05-23	34	15–48	8.0 µg/m³	4h	2

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