SmogRank / Mexico / Guanajuato

Air quality in San Luis de la Paz

Guanajuato, Mexico. PM2.5 from 2 reference monitors, updated hourly.

6.2 µg/m³
Good

Latest hour (07:00 UTC), 0.4× the WHO 24-hour guideline.

Rank

24 h
–
not enough data
7 days
#1,004
of 2,333 · 7.8 µg/m³
30 days
#308
of 2,331 · 12.1 µg/m³
Year
#307
of 2,173 · 15.6 µg/m³

Why it ranks here

Cleaner than usual. The last 7 days averaged 7.8 µg/m³, well below its typical 15.1; rain or wind often clears the air for a while.

Based on San Luis de la Paz's own measurements; causes are the usual kinds for a pattern like this, not a confirmed source.

Last 4 days, hour by hour

15302026-09-30 22:00 UTC: 6.1 µg/m³2026-09-30 23:00 UTC: 8.9 µg/m³2026-10-01 01:00 UTC: 5.9 µg/m³2026-10-01 04:00 UTC: 6.0 µg/m³2026-10-01 07:00 UTC: 6.2 µg/m³Sep 28Sep 29Sep 30Oct 1

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

Every day for a year

SepNovDecJanFebMarAprMayJunJulAugSepMonWedFri2025-09-29: 9.0 µg/m³2025-09-30: 10.9 µg/m³2025-10-01: 15.1 µg/m³2025-10-02: 16.0 µg/m³2025-10-03: 13.3 µg/m³2025-10-04: 13.7 µg/m³2025-10-05: 15.5 µg/m³2025-10-06: 15.2 µg/m³2025-10-07: 13.5 µg/m³2025-10-08: 5.6 µg/m³2025-10-09: 4.8 µg/m³2025-10-10: 5.7 µg/m³2025-10-11: 4.2 µg/m³2025-10-12: 8.9 µg/m³2025-10-13: 10.2 µg/m³2025-10-14: no data2025-10-15: no data2025-10-16: no data2025-10-17: 19.5 µg/m³2025-10-18: 18.4 µg/m³2025-10-19: 13.6 µg/m³2025-10-20: 17.2 µg/m³2025-10-21: no data2025-10-22: 15.2 µg/m³2025-10-23: 10.7 µg/m³2025-10-24: 15.5 µg/m³2025-10-25: 19.7 µg/m³2025-10-26: 15.0 µg/m³2025-10-27: 17.4 µg/m³2025-10-28: no data2025-10-29: 14.0 µg/m³2025-10-30: no data2025-10-31: no data2025-11-01: no data2025-11-02: 15.5 µg/m³2025-11-03: 11.0 µg/m³2025-11-04: 13.5 µg/m³2025-11-05: 14.1 µg/m³2025-11-06: 10.2 µg/m³2025-11-07: 15.0 µg/m³2025-11-08: 18.3 µg/m³2025-11-09: 13.2 µg/m³2025-11-10: 13.2 µg/m³2025-11-11: no data2025-11-12: no data2025-11-13: no data2025-11-14: no data2025-11-15: no data2025-11-16: no data2025-11-17: no data2025-11-18: no data2025-11-19: no data2025-11-20: no data2025-11-21: 25.0 µg/m³2025-11-22: 21.6 µg/m³2025-11-23: 19.8 µg/m³2025-11-24: 23.6 µg/m³2025-11-25: no data2025-11-26: no data2025-11-27: 8.9 µg/m³2025-11-28: 4.9 µg/m³2025-11-29: 14.6 µg/m³2025-11-30: 24.8 µg/m³2025-12-01: 25.8 µg/m³2025-12-02: 26.5 µg/m³2025-12-03: no data2025-12-04: 21.5 µg/m³2025-12-05: 24.1 µg/m³2025-12-06: 19.5 µg/m³2025-12-07: 16.1 µg/m³2025-12-08: 9.9 µg/m³2025-12-09: no data2025-12-10: no data2025-12-11: 9.9 µg/m³2025-12-12: 24.4 µg/m³2025-12-13: 20.0 µg/m³2025-12-14: 14.7 µg/m³2025-12-15: 7.1 µg/m³2025-12-16: 21.6 µg/m³2025-12-17: 27.1 µg/m³2025-12-18: no data2025-12-19: no data2025-12-20: no data2025-12-21: 17.7 µg/m³2025-12-22: 28.6 µg/m³2025-12-23: 6.0 µg/m³2025-12-24: 6.5 µg/m³2025-12-25: 8.3 µg/m³2025-12-26: 13.7 µg/m³2025-12-27: 17.5 µg/m³2025-12-28: 17.5 µg/m³2025-12-29: 17.2 µg/m³2025-12-30: 6.2 µg/m³2025-12-31: 12.5 µg/m³2026-01-01: 21.6 µg/m³2026-01-02: 19.3 µg/m³2026-01-03: 22.0 µg/m³2026-01-04: 20.3 µg/m³2026-01-05: 28.6 µg/m³2026-01-06: 28.9 µg/m³2026-01-07: 25.1 µg/m³2026-01-08: no data2026-01-09: no data2026-01-10: no data2026-01-11: no data2026-01-12: no data2026-01-13: 17.3 µg/m³2026-01-14: no data2026-01-15: no data2026-01-16: no data2026-01-17: no data2026-01-18: no data2026-01-19: no data2026-01-20: 15.0 µg/m³2026-01-21: 13.1 µg/m³2026-01-22: 13.3 µg/m³2026-01-23: 17.2 µg/m³2026-01-24: 14.4 µg/m³2026-01-25: 11.7 µg/m³2026-01-26: 13.5 µg/m³2026-01-27: 14.7 µg/m³2026-01-28: no data2026-01-29: 14.2 µg/m³2026-01-30: no data2026-01-31: no data2026-02-01: no data2026-02-02: no data2026-02-03: no data2026-02-04: 14.6 µg/m³2026-02-05: 10.0 µg/m³2026-02-06: 12.2 µg/m³2026-02-07: 17.3 µg/m³2026-02-08: 12.5 µg/m³2026-02-09: 13.3 µg/m³2026-02-10: no data2026-02-11: no data2026-02-12: 21.6 µg/m³2026-02-13: no data2026-02-14: no data2026-02-15: no data2026-02-16: no data2026-02-17: no data2026-02-18: no data2026-02-19: 29.9 µg/m³2026-02-20: 23.1 µg/m³2026-02-21: 22.4 µg/m³2026-02-22: 19.6 µg/m³2026-02-23: 14.8 µg/m³2026-02-24: 17.0 µg/m³2026-02-25: 17.0 µg/m³2026-02-26: 20.7 µg/m³2026-02-27: 13.6 µg/m³2026-02-28: 19.4 µg/m³2026-03-01: 20.4 µg/m³2026-03-02: 17.1 µg/m³2026-03-03: 16.0 µg/m³2026-03-04: 18.5 µg/m³2026-03-05: 20.6 µg/m³2026-03-06: 38.7 µg/m³2026-03-07: 20.5 µg/m³2026-03-08: no data2026-03-09: no data2026-03-10: no data2026-03-11: 18.3 µg/m³2026-03-12: no data2026-03-13: no data2026-03-14: 19.1 µg/m³2026-03-15: 21.3 µg/m³2026-03-16: 29.7 µg/m³2026-03-17: 25.0 µg/m³2026-03-18: 18.7 µg/m³2026-03-19: 16.1 µg/m³2026-03-20: no data2026-03-21: no data2026-03-22: 12.2 µg/m³2026-03-23: 15.4 µg/m³2026-03-24: 15.0 µg/m³2026-03-25: 16.9 µg/m³2026-03-26: 16.0 µg/m³2026-03-27: no data2026-03-28: no data2026-03-29: no data2026-03-30: no data2026-03-31: 12.8 µg/m³2026-04-01: 12.9 µg/m³2026-04-02: 17.2 µg/m³2026-04-03: 16.7 µg/m³2026-04-04: 17.0 µg/m³2026-04-05: 19.1 µg/m³2026-04-06: 6.9 µg/m³2026-04-07: 9.2 µg/m³2026-04-08: 12.5 µg/m³2026-04-09: 16.5 µg/m³2026-04-10: 14.3 µg/m³2026-04-11: 13.7 µg/m³2026-04-12: 12.2 µg/m³2026-04-13: 11.7 µg/m³2026-04-14: no data2026-04-15: no data2026-04-16: no data2026-04-17: 21.7 µg/m³2026-04-18: 23.2 µg/m³2026-04-19: 18.4 µg/m³2026-04-20: 7.0 µg/m³2026-04-21: 11.2 µg/m³2026-04-22: 13.8 µg/m³2026-04-23: no data2026-04-24: 16.6 µg/m³2026-04-25: 19.3 µg/m³2026-04-26: 21.8 µg/m³2026-04-27: 22.7 µg/m³2026-04-28: 20.7 µg/m³2026-04-29: 21.6 µg/m³2026-04-30: 19.7 µg/m³2026-05-01: 29.5 µg/m³2026-05-02: 34.3 µg/m³2026-05-03: 10.0 µg/m³2026-05-04: 17.8 µg/m³2026-05-05: 25.8 µg/m³2026-05-06: no data2026-05-07: 24.6 µg/m³2026-05-08: 32.7 µg/m³2026-05-09: 23.3 µg/m³2026-05-10: 21.3 µg/m³2026-05-11: 14.0 µg/m³2026-05-12: no data2026-05-13: no data2026-05-14: no data2026-05-15: no data2026-05-16: no data2026-05-17: 16.5 µg/m³2026-05-18: 22.2 µg/m³2026-05-19: 27.4 µg/m³2026-05-20: no data2026-05-21: no data2026-05-22: no data2026-05-23: no data2026-05-24: 15.3 µg/m³2026-05-25: 16.8 µg/m³2026-05-26: 14.7 µg/m³2026-05-27: 14.5 µg/m³2026-05-28: 11.5 µg/m³2026-05-29: 16.1 µg/m³2026-05-30: 16.6 µg/m³2026-05-31: 13.4 µg/m³2026-06-01: 13.6 µg/m³2026-06-02: no data2026-06-03: no data2026-06-04: no data2026-06-05: no data2026-06-06: no data2026-06-07: 8.5 µg/m³2026-06-08: 9.4 µg/m³2026-06-09: 7.1 µg/m³2026-06-10: no data2026-06-11: 6.5 µg/m³2026-06-12: 7.4 µg/m³2026-06-13: 5.4 µg/m³2026-06-14: 13.1 µg/m³2026-06-15: 12.1 µg/m³2026-06-16: 11.4 µg/m³2026-06-17: 10.2 µg/m³2026-06-18: 10.6 µg/m³2026-06-19: 7.1 µg/m³2026-06-20: 9.9 µg/m³2026-06-21: 11.5 µg/m³2026-06-22: 15.2 µg/m³2026-06-23: no data2026-06-24: no data2026-06-25: no data2026-06-26: 12.3 µg/m³2026-06-27: 12.9 µg/m³2026-06-28: 9.0 µg/m³2026-06-29: 12.4 µg/m³2026-06-30: 13.8 µg/m³2026-07-01: 17.8 µg/m³2026-07-02: 12.1 µg/m³2026-07-03: 11.9 µg/m³2026-07-04: 12.8 µg/m³2026-07-05: 14.1 µg/m³2026-07-06: 14.1 µg/m³2026-07-07: 12.8 µg/m³2026-07-08: 9.1 µg/m³2026-07-09: 7.5 µg/m³2026-07-10: 9.4 µg/m³2026-07-11: 7.3 µg/m³2026-07-12: 10.8 µg/m³2026-07-13: 8.3 µg/m³2026-07-14: 15.6 µg/m³2026-07-15: 14.6 µg/m³2026-07-16: 12.0 µg/m³2026-07-17: 10.1 µg/m³2026-07-18: 17.5 µg/m³2026-07-19: 21.0 µg/m³2026-07-20: 20.6 µg/m³2026-07-21: 16.4 µg/m³2026-07-22: 14.2 µg/m³2026-07-23: 11.2 µg/m³2026-07-24: 12.9 µg/m³2026-07-25: 17.0 µg/m³2026-07-26: 11.8 µg/m³2026-07-27: 12.1 µg/m³2026-07-28: 12.6 µg/m³2026-07-29: 16.2 µg/m³2026-07-30: 20.9 µg/m³2026-07-31: 15.2 µg/m³2026-08-01: 16.9 µg/m³2026-08-02: 18.5 µg/m³2026-08-03: 16.7 µg/m³2026-08-04: 20.1 µg/m³2026-08-05: 19.8 µg/m³2026-08-06: 15.5 µg/m³2026-08-07: 15.3 µg/m³2026-08-08: 22.1 µg/m³2026-08-09: 20.3 µg/m³2026-08-10: 16.9 µg/m³2026-08-11: 11.4 µg/m³2026-08-12: 10.7 µg/m³2026-08-13: 16.3 µg/m³2026-08-14: 15.1 µg/m³2026-08-15: 16.9 µg/m³2026-08-16: 16.5 µg/m³2026-08-17: 12.2 µg/m³2026-08-18: 15.0 µg/m³2026-08-19: 10.6 µg/m³2026-08-20: 10.9 µg/m³2026-08-21: 15.4 µg/m³2026-08-22: 12.7 µg/m³2026-08-23: 17.2 µg/m³2026-08-24: 8.5 µg/m³2026-08-25: 10.5 µg/m³2026-08-26: 13.8 µg/m³2026-08-27: 14.0 µg/m³2026-08-28: 13.2 µg/m³2026-08-29: 13.6 µg/m³2026-08-30: 16.9 µg/m³2026-08-31: 19.4 µg/m³2026-09-01: 17.5 µg/m³2026-09-02: 13.3 µg/m³2026-09-03: 14.4 µg/m³2026-09-04: 15.5 µg/m³2026-09-05: 18.0 µg/m³2026-09-06: 15.3 µg/m³2026-09-07: 11.3 µg/m³2026-09-08: 10.1 µg/m³2026-09-09: 10.0 µg/m³2026-09-10: no data2026-09-11: no data2026-09-12: 16.2 µg/m³2026-09-13: 14.0 µg/m³2026-09-14: 10.2 µg/m³2026-09-15: no data2026-09-16: 21.4 µg/m³2026-09-17: 14.2 µg/m³2026-09-18: 6.0 µg/m³2026-09-19: 6.9 µg/m³2026-09-20: no data2026-09-21: no data2026-09-22: no data2026-09-23: no data2026-09-24: no data2026-09-25: 5.5 µg/m³2026-09-26: 4.2 µg/m³2026-09-27: 7.5 µg/m³2026-09-28: 8.4 µg/m³2026-09-29: 13.3 µg/m³2026-09-30: no data
Good 0–9.0Moderate 9.1+Unhealthy for sensitive groups 35.5+Unhealthy 55.5+Very unhealthy 125.5+Hazardous 225.5+No data

134 of 271 measured days were over the WHO 24-hour guideline.

Daily world rank

#1#1967OctNovDecJanFebMarAprMayJunJulAugSep

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

2026 against 2025, month by month

15Jan 2025: 19.6 µg/m³Jan 2026: 18.2 µg/m³JanFeb 2025: 19.1 µg/m³Feb 2026: 17.6 µg/m³FebMar 2025: 29.4 µg/m³Mar 2026: 19.4 µg/m³MarApr 2025: 26.1 µg/m³Apr 2026: 16.1 µg/m³AprMay 2026: 19.9 µg/m³MayJun 2026: 10.4 µg/m³JunJul 2026: 13.5 µg/m³JulAug 2026: 15.3 µg/m³AugSep 2025: 11.4 µg/m³Sep 2026: 12.1 µg/m³SepOct 2025: 13.2 µg/m³OctNov 2025: 15.7 µg/m³NovDec 2025: 16.8 µg/m³Dec

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

This week against past years

This weekThis week: 7.8 µg/m³7.820252025: 12.5 µg/m³12.52024no data20232023: 11.4 µg/m³11.4

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

Monitors

StationOperatorType
Estación San Luis deUS Public DomainAirNowReference
Presidencia MunicipalMexico SINAICA Terms and ConditionsSinaica MexicoReference

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 Mexico

San Luis Potosí 31.7Tuxtla 29.1Hacienda Santa Fe 24.0San Salvador Tizatlalli 19.3Ciudad Nezahualcoyotl 18.0Naucalpan de Juárez 17.9Santa Anita 17.8Aguascalientes 17.8Guadalajara 17.5Saltillo 17.3Puebla 15.5Mexico City 14.9

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

Updated 2026-10-01 09:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.