SmogRank / Spain / Castille and León

Air quality in León

Castille and León, Spain. PM2.5 from 1 reference monitor, updated hourly.

2.0 µg/m³
Good

Latest hour (02:00 UTC), 0.1× the WHO 24-hour guideline.

Rank

24 h
–
not enough data
7 days
#832
of 2,341 · 8.4 µg/m³
30 days
–
not enough data
Year
–
not enough data

Last 4 days, hour by hour

15302026-09-30 23:00 UTC: 3.0 µg/m³2026-10-01 00:00 UTC: 3.0 µg/m³2026-10-01 02:00 UTC: 2.0 µg/m³Sep 28Sep 29Sep 30

Times in UTC. Dashed line: WHO 24-hour guideline (15 µg/m³).

Every day for a year

SepNovDecJanFebMarAprMayJunJulAugSepMonWedFri2025-09-29: 3.5 µg/m³2025-09-30: 4.4 µg/m³2025-10-01: no data2025-10-02: 3.9 µg/m³2025-10-03: 5.4 µg/m³2025-10-04: 2.4 µg/m³2025-10-05: 1.7 µg/m³2025-10-06: no data2025-10-07: no data2025-10-08: 7.1 µg/m³2025-10-09: 3.9 µg/m³2025-10-10: 3.8 µg/m³2025-10-11: 4.6 µg/m³2025-10-12: 4.3 µg/m³2025-10-13: 5.0 µg/m³2025-10-14: 4.4 µg/m³2025-10-15: no data2025-10-16: no data2025-10-17: no data2025-10-18: 8.6 µg/m³2025-10-19: 11.3 µg/m³2025-10-20: 1.7 µg/m³2025-10-21: 2.5 µg/m³2025-10-22: 2.7 µg/m³2025-10-23: 8.4 µg/m³2025-10-24: 5.7 µg/m³2025-10-25: 2.3 µg/m³2025-10-26: 3.1 µg/m³2025-10-27: 5.7 µg/m³2025-10-28: 7.3 µg/m³2025-10-29: 4.4 µg/m³2025-10-30: 5.6 µg/m³2025-10-31: 2.8 µg/m³2025-11-01: 3.0 µg/m³2025-11-02: 4.1 µg/m³2025-11-03: 6.4 µg/m³2025-11-04: 11.2 µg/m³2025-11-05: 8.6 µg/m³2025-11-06: 2.7 µg/m³2025-11-07: 5.3 µg/m³2025-11-08: 4.4 µg/m³2025-11-09: 7.9 µg/m³2025-11-10: 10.4 µg/m³2025-11-11: 5.0 µg/m³2025-11-12: 6.9 µg/m³2025-11-13: 5.1 µg/m³2025-11-14: 2.0 µg/m³2025-11-15: 2.2 µg/m³2025-11-16: 2.4 µg/m³2025-11-17: 4.6 µg/m³2025-11-18: 7.1 µg/m³2025-11-19: 3.6 µg/m³2025-11-20: 3.2 µg/m³2025-11-21: 3.6 µg/m³2025-11-22: 7.6 µg/m³2025-11-23: 10.0 µg/m³2025-11-24: 2.7 µg/m³2025-11-25: 2.7 µg/m³2025-11-26: 5.7 µg/m³2025-11-27: 8.3 µg/m³2025-11-28: no data2025-11-29: no data2025-11-30: no data2025-12-01: 5.9 µg/m³2025-12-02: 5.5 µg/m³2025-12-03: 4.9 µg/m³2025-12-04: 8.4 µg/m³2025-12-05: 8.3 µg/m³2025-12-06: 3.3 µg/m³2025-12-07: 2.4 µg/m³2025-12-08: 5.4 µg/m³2025-12-09: 5.2 µg/m³2025-12-10: 3.8 µg/m³2025-12-11: 6.3 µg/m³2025-12-12: 4.8 µg/m³2025-12-13: 8.3 µg/m³2025-12-14: no data2025-12-15: 8.3 µg/m³2025-12-16: 11.3 µg/m³2025-12-17: 38.0 µg/m³2025-12-18: 9.4 µg/m³2025-12-19: 3.4 µg/m³2025-12-20: 4.5 µg/m³2025-12-21: 3.3 µg/m³2025-12-22: 3.5 µg/m³2025-12-23: 9.8 µg/m³2025-12-24: 7.9 µg/m³2025-12-25: 3.4 µg/m³2025-12-26: 13.3 µg/m³2025-12-27: 3.7 µg/m³2025-12-28: 2.8 µg/m³2025-12-29: 9.7 µg/m³2025-12-30: 12.0 µg/m³2025-12-31: 12.0 µg/m³2026-01-01: no data2026-01-02: no data2026-01-03: 13.0 µg/m³2026-01-04: 3.5 µg/m³2026-01-05: 6.3 µg/m³2026-01-06: 6.1 µg/m³2026-01-07: no data2026-01-08: no data2026-01-09: 2.6 µg/m³2026-01-10: 4.4 µg/m³2026-01-11: 10.7 µg/m³2026-01-12: 5.2 µg/m³2026-01-13: 7.0 µg/m³2026-01-14: 5.3 µg/m³2026-01-15: no data2026-01-16: 9.8 µg/m³2026-01-17: 5.2 µg/m³2026-01-18: 3.0 µg/m³2026-01-19: 7.4 µg/m³2026-01-20: 12.9 µg/m³2026-01-21: 4.9 µg/m³2026-01-22: 3.0 µg/m³2026-01-23: 5.1 µg/m³2026-01-24: 3.0 µg/m³2026-01-25: 4.1 µg/m³2026-01-26: 7.5 µg/m³2026-01-27: 2.4 µg/m³2026-01-28: 7.2 µg/m³2026-01-29: 6.6 µg/m³2026-01-30: 5.7 µg/m³2026-01-31: 4.0 µg/m³2026-02-01: 9.1 µg/m³2026-02-02: 1.9 µg/m³2026-02-03: 2.6 µg/m³2026-02-04: 5.1 µg/m³2026-02-05: 3.5 µg/m³2026-02-06: 3.5 µg/m³2026-02-07: 3.2 µg/m³2026-02-08: 3.5 µg/m³2026-02-09: no data2026-02-10: no data2026-02-11: no data2026-02-12: no data2026-02-13: no data2026-02-14: no data2026-02-15: no data2026-02-16: no data2026-02-17: no data2026-02-18: no data2026-02-19: no data2026-02-20: no data2026-02-21: no data2026-02-22: no data2026-02-23: no data2026-02-24: no data2026-02-25: no data2026-02-26: no data2026-02-27: no data2026-02-28: no data2026-03-01: no data2026-03-02: no data2026-03-03: no data2026-03-04: no data2026-03-05: no data2026-03-06: no data2026-03-07: no data2026-03-08: no data2026-03-09: no data2026-03-10: no data2026-03-11: no data2026-03-12: no data2026-03-13: no data2026-03-14: no data2026-03-15: no data2026-03-16: no data2026-03-17: no data2026-03-18: no data2026-03-19: no data2026-03-20: no data2026-03-21: no data2026-03-22: no data2026-03-23: no data2026-03-24: no data2026-03-25: no data2026-03-26: no data2026-03-27: no data2026-03-28: no data2026-03-29: no data2026-03-30: no data2026-03-31: no data2026-04-01: no data2026-04-02: no data2026-04-03: no data2026-04-04: no data2026-04-05: no data2026-04-06: no data2026-04-07: no data2026-04-08: no data2026-04-09: no data2026-04-10: no data2026-04-11: no data2026-04-12: no data2026-04-13: no data2026-04-14: no data2026-04-15: no data2026-04-16: no data2026-04-17: no data2026-04-18: no data2026-04-19: no data2026-04-20: no data2026-04-21: no data2026-04-22: no data2026-04-23: no data2026-04-24: no data2026-04-25: no data2026-04-26: no data2026-04-27: no data2026-04-28: no data2026-04-29: no data2026-04-30: no data2026-05-01: no data2026-05-02: no data2026-05-03: no data2026-05-04: no data2026-05-05: no data2026-05-06: no data2026-05-07: no data2026-05-08: no data2026-05-09: no data2026-05-10: no data2026-05-11: no data2026-05-12: no data2026-05-13: no data2026-05-14: no data2026-05-15: no data2026-05-16: no data2026-05-17: no data2026-05-18: no data2026-05-19: no data2026-05-20: no data2026-05-21: no data2026-05-22: no data2026-05-23: no data2026-05-24: no data2026-05-25: no data2026-05-26: no data2026-05-27: no data2026-05-28: 10.5 µg/m³2026-05-29: no data2026-05-30: no data2026-05-31: no data2026-06-01: no data2026-06-02: no data2026-06-03: no data2026-06-04: no data2026-06-05: no data2026-06-06: no data2026-06-07: no data2026-06-08: no data2026-06-09: no data2026-06-10: no data2026-06-11: no data2026-06-12: no data2026-06-13: no data2026-06-14: no data2026-06-15: no data2026-06-16: no data2026-06-17: no data2026-06-18: no data2026-06-19: 8.6 µg/m³2026-06-20: 10.8 µg/m³2026-06-21: no data2026-06-22: no data2026-06-23: no data2026-06-24: 15.8 µg/m³2026-06-25: 9.4 µg/m³2026-06-26: no data2026-06-27: no data2026-06-28: no data2026-06-29: 2.0 µg/m³2026-06-30: 3.7 µg/m³2026-07-01: no data2026-07-02: 2.3 µg/m³2026-07-03: 2.4 µg/m³2026-07-04: 3.4 µg/m³2026-07-05: 3.9 µg/m³2026-07-06: no data2026-07-07: no data2026-07-08: 13.6 µg/m³2026-07-09: 12.3 µg/m³2026-07-10: 15.1 µg/m³2026-07-11: 9.3 µg/m³2026-07-12: 10.0 µg/m³2026-07-13: 8.0 µg/m³2026-07-14: 8.3 µg/m³2026-07-15: 8.6 µg/m³2026-07-16: 7.7 µg/m³2026-07-17: 5.7 µg/m³2026-07-18: 5.8 µg/m³2026-07-19: 7.1 µg/m³2026-07-20: no data2026-07-21: no data2026-07-22: no data2026-07-23: no data2026-07-24: no data2026-07-25: no data2026-07-26: 6.0 µg/m³2026-07-27: 4.1 µg/m³2026-07-28: 16.3 µg/m³2026-07-29: no data2026-07-30: no data2026-07-31: no data2026-08-01: 10.3 µg/m³2026-08-02: 6.8 µg/m³2026-08-03: 7.4 µg/m³2026-08-04: 6.1 µg/m³2026-08-05: 5.3 µg/m³2026-08-06: 4.3 µg/m³2026-08-07: 4.7 µg/m³2026-08-08: no data2026-08-09: no data2026-08-10: 6.5 µg/m³2026-08-11: 9.6 µg/m³2026-08-12: 13.6 µg/m³2026-08-13: 22.6 µg/m³2026-08-14: 19.7 µg/m³2026-08-15: 10.4 µg/m³2026-08-16: no data2026-08-17: no data2026-08-18: 14.9 µg/m³2026-08-19: 14.8 µg/m³2026-08-20: 8.5 µg/m³2026-08-21: 2.2 µg/m³2026-08-22: 5.1 µg/m³2026-08-23: 6.7 µg/m³2026-08-24: no data2026-08-25: no data2026-08-26: no data2026-08-27: no data2026-08-28: 2.1 µg/m³2026-08-29: no data2026-08-30: no data2026-08-31: 4.1 µg/m³2026-09-01: 4.5 µg/m³2026-09-02: no data2026-09-03: no data2026-09-04: no data2026-09-05: no data2026-09-06: no data2026-09-07: no data2026-09-08: no data2026-09-09: no data2026-09-10: no data2026-09-11: no data2026-09-12: no data2026-09-13: no data2026-09-14: no data2026-09-15: no data2026-09-16: no data2026-09-17: no data2026-09-18: 2.4 µg/m³2026-09-19: 2.6 µg/m³2026-09-20: 3.0 µg/m³2026-09-21: 3.7 µg/m³2026-09-22: 3.3 µg/m³2026-09-23: 3.0 µg/m³2026-09-24: 5.1 µg/m³2026-09-25: 7.3 µg/m³2026-09-26: 8.5 µg/m³2026-09-27: 9.2 µg/m³2026-09-28: 11.9 µg/m³2026-09-29: 8.8 µg/m³2026-09-30: 8.1 µg/m³
Good 0–9.0Moderate 9.1+Unhealthy for sensitive groups 35.5+Unhealthy 55.5+Very unhealthy 125.5+Hazardous 225.5+No data

6 of 177 measured days were over the WHO 24-hour guideline.

Daily world rank

#1#2338NovDecJanFebMarAprMayJunJulAugSep

Rank on each day's board (1 = most polluted city that day).

2026 against 2025, month by month

15Jan 2025: 10.5 µg/m³Jan 2026: 6.0 µg/m³JanFeb 2025: 12.1 µg/m³FebMar 2025: 4.7 µg/m³MarApr 2025: 4.8 µg/m³AprMay 2025: 4.7 µg/m³MayJun 2025: 9.3 µg/m³JunJul 2025: 6.2 µg/m³Jul 2026: 7.9 µg/m³JulAug 2025: 26.5 µg/m³Aug 2026: 8.8 µg/m³AugSep 2025: 4.7 µg/m³Sep 2026: 5.8 µg/m³SepOct 2025: 4.7 µg/m³OctNov 2025: 5.4 µg/m³NovDec 2025: 7.6 µg/m³Dec

Faded bars: 2025. A month shows once it has 10 measured days.

This week against past years

This weekThis week: 8.4 µg/m³8.420252025: 4.2 µg/m³4.2

Mean PM2.5 for 24 Sept to 30 Sept in each year. Dashed line: WHO 24-hour guideline.

Monitors

StationOperatorType
BARRIO PINILLAODC-BYEEAReference

The city's value is the median of its reference monitors each hour; low-cost sensors are listed but not counted when reference monitors exist. Data via OpenAQ; licences as listed. How we rank. Embed this on your site.

Other cities in Spain

Alcalá de Guadaira 17.7Sevilla 16.1Huelva 15.6Arrecife 13.7Manlleu 12.9Candelaria 12.3Bailén 11.7Fuenlabrada 11.5Valdemoro 11.1Gijón 10.8Durango 10.6Avilés 10.6

30-day averages, µg/m³. All of Spain →

Updated 2026-10-01 04:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.