SmogRank / World / Europe / Spain / Basque Country

Most polluted cities in Basque Country, Spain

15 measured cities, last 30 days; 0 above the WHO 24-hour guideline. Worst: Durango at 9.8 µg/m³, #666 in the world.

26 monitors in Spain stopped reporting on 6 Oct, 05:00 Madrid time. Cities that rely on them are missing from the 24-hour board and may drop from the longer ones; that isn't clean air, and they return when the data does.

Ranked by unhealthy days: the share of each city's measured days with a daily mean over 35.4 µg/m³ (US AQI 101+), Unhealthy for Sensitive Groups or worse on the US EPA's scale. Ties go to the higher average.

La RiojaNavarreCantabriaAragon: 1 measured cityCastille and León: 1 measured cityBasque Country: 15 measured cities#15 Bermeo: 5.0 µg/m³#14 Zierbena: 6.7 µg/m³#13 Getxo: 7.2 µg/m³#12 Donostia / San Sebastián: 7.5 µg/m³#11 Hernani: 7.7 µg/m³#10 Tolosa: 7.8 µg/m³#9 Amorebieta: 8.5 µg/m³#8 Zarautz: 8.7 µg/m³#5 Laudio / Llodio: 8.8 µg/m³#6 Zalla: 8.8 µg/m³#7 Beasain: 8.8 µg/m³#4 Oria: 9.1 µg/m³#3 Gasteiz / Vitoria: 9.3 µg/m³#2 Bilbao: 9.4 µg/m³#1 Durango: 9.8 µg/m³
Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.
← Durango 0% 0.75%0
Every measured city in Basque Country, Spain, one column each, ranked by unhealthy days: height is the share of its measured days that were unhealthy, colour its average. Point at it to read a city; tap to open it.
  1. 1Durangolast full day 1 Oct 0%
  2. 2Bilbao 0%
  3. 3Gasteiz / Vitoria 0%
  4. 4Oria 0%
  5. 5Laudio / Llodio 0%
  6. 5Zallalast full day 1 Oct 0%
  7. 5Beasainlast full day 30 Sept 0%
  8. 8Zarautzlast full day 30 Sept 0%
  9. 9Amorebietalast full day 30 Sept 0%
  10. 10Tolosa 0%
  11. 11Hernanilast full day 30 Sept 0%
  12. 12Donostia / San Sebastián 0%
  13. 13Getxo 0%
  14. 14Zierbena 0%
  15. 15Bermeolast full day 1 Oct 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

Estimated: cities without a monitor

Basque Country cities we can't measure, with model estimates for the last 7 days. Listed by population, not ranked: estimates aren't precise enough to rank. Model estimates from the Copernicus Atmosphere Monitoring Service (CAMS), adjusted to measured cities nearby where there are any. Adjusted, a single day lands within ×1.5 of what a monitor would read about two times in three; unadjusted, it can be off by half or double. Treat them as a guide, not a measurement.

City7-day estimateBand
Barakaldo≈ 9 µg/m³Moderate
Irun≈ 5 µg/m³Good
Santutxu≈ 9 µg/m³Moderate
Santurtzi≈ 8 µg/m³Good
Portugalete≈ 8 µg/m³Good
Basauri≈ 9 µg/m³Moderate
Errenteria≈ 6 µg/m³Good
Leioa≈ 9 µg/m³Moderate
Galdakao≈ 9 µg/m³Moderate
Sestao≈ 8 µg/m³Good
Eibar≈ 7 µg/m³Good
Erandio≈ 9 µg/m³Moderate
Arrasate / Mondragón≈ 7 µg/m³Good
Lasarte≈ 6 µg/m³Good
Hondarribia≈ 5 µg/m³Good
Ermua≈ 7 µg/m³Good
Gernika-Lumo≈ 9 µg/m³Moderate
Mungia≈ 9 µg/m³Moderate
Pasaia≈ 6 µg/m³Good

Bad-air episodes in Basque Country

Times when many cities around here had PM2.5 at twice their usual or more on the same days.

Use this board

SmogRank, most polluted cities in Basque Country, Spain, PM2.5, last 30 days to 6 Oct 2026, 22:00 UTC, smogrank.com/es/region/basque-country?w=30d.

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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.

Updated 2026-10-06 22:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.