SmogRank / Countries / Spain / Castille and León

Most polluted cities in Castille and León, Spain

10 measured cities, last 7 days; 0 above the WHO 24-hour guideline. Worst: Valladolid at 11.6 µg/m³, #359 in the world.

8 good  2 moderate

  1. 1Valladolid 11.6
  2. 2Aranda de Duero 9.6
  3. 3Ponferrada 9.0
  4. 4Medina del Campo 9.0
  5. 5Palencia 8.5
  6. 6Miranda de Ebro 8.4
  7. 7León 8.4
  8. 8Salamanca 8.3
  9. 9Burgos 7.9
  10. 10Soria 7.4
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+

Estimated: cities without a monitor

Castille and León 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
Zamora≈ 10 µg/m³Moderate
Ávila≈ 6 µg/m³Good
Segovia≈ 7 µg/m³Good
San Andrés del Rabanedo≈ 9 µg/m³Good
Laguna de Duero≈ 10 µg/m³Moderate
Benavente≈ 9 µg/m³Moderate
Villaquilambre≈ 9 µg/m³Good
Béjar≈ 6 µg/m³Good

Updated 2026-10-01 20:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.