What is the air quality trend in Ermua?

Over the past 3 days, Ermua had an average AQI of 44 based on station measurements. The worst day was 2026-07-21 with AQI 50.

How is Ermua air quality measured?

Air quality in Ermua 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 Ermua, Spain

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

Historical PM2.5 and AQI trend from monitoring stations near Ermua, Spain.

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

48h

PM2.5 Station

48h · 10 stations

Temperature GFS model

7pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-07-22	37	25–53	8.9 µg/m³	18.9	12h	20
2026-07-21	50	28–110	13.3 µg/m³	18.4	24h	30
2026-07-20	46	23–75	11.6 µg/m³	17.2	12h	29

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