SmogRank / World / Spain / Basque Country / February 2023

Most polluted cities in Basque Country, Spain, February 2023

11 cities in Basque Country, Spain ranked by their average PM2.5 over the 28 days. Worst: Hernani at 20.7 µg/m³, #119 of 1,088 cities in the world. Cleanest: Zarautz at 7.4. A city needs measurements on 70% of the days to be ranked.

OpenAQ's archive, where our readings come from, has almost none for 25 of these 28 days. Cities in the United States and Europe have them from the EPA's and the European Environment Agency's own records of the same monitors; many cities elsewhere are missing from this board, not clean. Why.

About 7.13K people in these 3 cities breathed unhealthy air on an average day of February 2023.

Ranked by people: each city's population times its share of unhealthy days, those with a daily mean over 35.4 µg/m³ (US AQI 101+). That is how many people living there breathed unhealthy air on an average day. Only cities measured at 2 or more places at least 3 km apart are ranked: one monitor shouldn't speak for a whole city. Population is the city itself, not its wider metro area.

← Donostia / San Sebastián 7.13K 7K0
Every city in Basque Country, Spain ranked for February 2023 with monitors in two or more places, one column each, ranked by people breathing unhealthy air: height is people on an average day, colour its average. Point at it to read a city; tap to open it.
  1. 1Donostia / San Sebastián
    7.13K
  2. 2Oria
    0
  3. 3Bilbao
    0
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

All cities in the world, February 2023 · All cities in Spain, February 2023 · Basque Country now

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SmogRank, most polluted cities in Basque Country, Spain, PM2.5, February 2023, smogrank.com/es/region/basque-country/history/2023-02 (accessed 7 Oct 2026).

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You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.