What is the air quality trend in San Sebastián de los Reyes?

Over the past 3 days, San Sebastián de los Reyes had an average AQI of 42 based on station measurements. The worst day was 2026-10-20 with AQI 48.

How is San Sebastián de los Reyes air quality measured?

Air quality in San Sebastián de los Reyes 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 San Sebastián de los Reyes, Spain

Name: San Sebastián de los Reyes Air Quality History
Creator: CERNS.IO
License: https://creativecommons.org/licenses/by/4.0/

Historical PM2.5 and AQI trend from monitoring stations near San Sebastián de los Reyes, Spain.

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

47h

PM2.5 Station

47h · 1 station

Temperature GFS model

8pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-10-21	36	2–69	9.3 µg/m³	10.5	18h	1
2026-10-20	48	6–118	14.5 µg/m³	16.2	24h	1
2026-10-19	44	33–55	10.7 µg/m³	11.3	5h	1

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