What is the air quality trend in Viana do Castelo?

Over the past 21 days, Viana do Castelo had an average AQI of 39 based on station measurements. The worst day was 2026-05-15 with AQI 41.

How is Viana do Castelo air quality measured?

Air quality in Viana do Castelo 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 Viana do Castelo, Portugal

Name: Viana do Castelo Air Quality History
Creator: CERNS.IO
License: https://creativecommons.org/licenses/by/4.0/

Historical PM2.5 and AQI trend from monitoring stations near Viana do Castelo, Portugal.

Current AQI
Good CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

480h

PM2.5 Station

480h · 4 stations

Temperature GFS model

80pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-05-30	40	37–41	9.4 µg/m³	9.0	22h	4
2026-05-29	38	33–40	9.2 µg/m³	9.0	24h	4
2026-05-28	39	34–42	9.3 µg/m³	9.0	24h	4
2026-05-27	39	32–44	9.4 µg/m³	9.0	24h	4
2026-05-26	40	35–45	9.5 µg/m³	9.0	24h	4
2026-05-25	40	33–45	9.5 µg/m³	9.0	24h	4
2026-05-24	39	33–42	9.3 µg/m³	9.0	24h	4
2026-05-23	40	34–48	9.6 µg/m³	9.0	24h	4
2026-05-22	39	34–42	9.4 µg/m³	9.0	23h	4
2026-05-21	39	23–43	9.3 µg/m³	9.0	24h	4
2026-05-20	39	34–40	9.3 µg/m³	9.0	24h	4
2026-05-19	39	32–42	9.3 µg/m³	9.0	24h	4
2026-05-18	38	32–40	9.1 µg/m³	9.0	24h	4
2026-05-17	39	32–40	9.3 µg/m³	9.0	24h	4
2026-05-16	39	34–42	9.4 µg/m³	9.0	24h	4
2026-05-15	41	33–48	9.8 µg/m³	9.0	24h	4
2026-05-14	39	32–51	9.4 µg/m³	9.0	24h	4
2026-05-13	40	33–52	9.5 µg/m³	9.0	24h	4
2026-05-12	38	32–40	9.0 µg/m³	9.0	24h	4
2026-05-11	38	32–52	9.1 µg/m³	9.0	24h	5
2026-05-10	40	40–41	9.6 µg/m³	9.0	3h	4

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