What is the air quality trend in Donostia / San Sebastián?

Over the past 15 days, Donostia / San Sebastián had an average AQI of 41 based on station measurements. The worst day was 2026-07-21 with AQI 49.

How is Donostia / San Sebastián air quality measured?

Air quality in Donostia / San Sebastián 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 Donostia / San Sebastián, Spain

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

Historical PM2.5 and AQI trend from monitoring stations near Donostia / San Sebastián, Spain.

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

335h

PM2.5 Station

335h · 8 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-07-22	40	23–64	10.1 µg/m³	18.1	8h	13
2026-07-21	49	28–93	12.7 µg/m³	29.6	24h	15
2026-07-20	43	28–66	10.7 µg/m³	28.5	24h	16
2026-07-19	38	27–52	9.0 µg/m³	18.2	24h	19
2026-07-18	47	23–71	11.9 µg/m³	16.2	24h	18
2026-07-17	43	29–68	10.5 µg/m³	19.8	24h	17
2026-07-16	44	30–66	10.9 µg/m³	24.8	24h	17
2026-07-15	46	29–120	11.6 µg/m³	24.5	24h	15
2026-07-14	43	27–71	10.7 µg/m³	15.5	24h	14
2026-07-13	40	28–84	10.0 µg/m³	34.1	24h	14
2026-07-12	39	27–72	9.5 µg/m³	24.2	24h	15
2026-07-11	38	24–72	9.4 µg/m³	15.7	24h	14
2026-07-10	38	22–70	9.3 µg/m³	24.7	24h	14
2026-07-09	36	24–54	8.7 µg/m³	17.6	24h	15
2026-07-08	39	30–52	9.3 µg/m³	24.3	15h	20

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