What is the air quality in San Sebastián?

San Sebastián, Spain has an annual US AQI of 51 (Reasonable) and average PM2.5 of 9.9 µg/m³, ranking #819 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in San Sebastián?

November is typically the cleanest month (AQI 46) and February the most polluted (AQI 56).

Where does San Sebastián's air quality data come from?

PM2.5: 1998–2026 (monitors 2020–2026, satellite 1998–2019; 2026 provisional). Measured by government monitoring stations. Full sources are on the methodology page.

San Sebastián, Spain — Air Quality & Clean City Guide 2026

San Sebastián Air Quality Data

Global rank	City	Continent	AQI	PM2.5
819	San Sebastián, Spain	Europe	AQI 51	PM2.5 9.9 µg/m³