SmogRank / Mexico / México

Air quality in San Salvador Tizatlalli

México, Mexico. PM2.5 from 1 reference monitor, updated hourly.

16.0 µg/m³
Moderate

Latest hour (04:00 UTC), 1.1× the WHO 24-hour guideline.

Rank

24 h
–
not enough data
7 days
#186
of 2,330 · 17.8 µg/m³
30 days
#173
of 2,327 · 19.3 µg/m³
Year
–
not enough data

Last 4 days, hour by hour

15302026-10-01 00:00 UTC: 26.0 µg/m³2026-10-01 01:00 UTC: 16.0 µg/m³2026-10-01 02:00 UTC: 17.0 µg/m³2026-10-01 03:00 UTC: 14.0 µg/m³2026-10-01 04:00 UTC: 16.0 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: 15.1 µg/m³2025-09-30: 24.5 µg/m³2025-10-01: 30.1 µg/m³2025-10-02: 26.3 µg/m³2025-10-03: 21.8 µg/m³2025-10-04: 24.6 µg/m³2025-10-05: 16.4 µg/m³2025-10-06: 13.7 µg/m³2025-10-07: 21.1 µg/m³2025-10-08: 15.5 µg/m³2025-10-09: 13.8 µg/m³2025-10-10: 14.8 µg/m³2025-10-11: 18.0 µg/m³2025-10-12: 21.2 µg/m³2025-10-13: 19.8 µg/m³2025-10-14: 23.3 µg/m³2025-10-15: 21.0 µg/m³2025-10-16: 28.3 µg/m³2025-10-17: 43.1 µg/m³2025-10-18: 29.1 µg/m³2025-10-19: 22.7 µg/m³2025-10-20: 29.0 µg/m³2025-10-21: 25.9 µg/m³2025-10-22: 21.3 µg/m³2025-10-23: 25.5 µg/m³2025-10-24: 26.5 µg/m³2025-10-25: 30.0 µg/m³2025-10-26: 29.3 µg/m³2025-10-27: 25.7 µg/m³2025-10-28: 23.1 µg/m³2025-10-29: no data2025-10-30: no data2025-10-31: 30.0 µg/m³2025-11-01: 40.8 µg/m³2025-11-02: 44.3 µg/m³2025-11-03: 34.4 µg/m³2025-11-04: 28.3 µg/m³2025-11-05: 26.5 µg/m³2025-11-06: 29.5 µg/m³2025-11-07: 32.9 µg/m³2025-11-08: 42.5 µg/m³2025-11-09: 28.2 µg/m³2025-11-10: 19.9 µg/m³2025-11-11: 25.8 µg/m³2025-11-12: 30.8 µg/m³2025-11-13: 36.7 µg/m³2025-11-14: 44.6 µg/m³2025-11-15: 32.1 µg/m³2025-11-16: 34.8 µg/m³2025-11-17: 29.4 µg/m³2025-11-18: 36.2 µg/m³2025-11-19: 36.0 µg/m³2025-11-20: 37.6 µg/m³2025-11-21: 48.6 µg/m³2025-11-22: 38.4 µg/m³2025-11-23: 37.8 µg/m³2025-11-24: 30.8 µg/m³2025-11-25: 34.4 µg/m³2025-11-26: 36.3 µg/m³2025-11-27: 25.1 µg/m³2025-11-28: 20.7 µg/m³2025-11-29: 24.5 µg/m³2025-11-30: 32.3 µg/m³2025-12-01: 35.7 µg/m³2025-12-02: 34.9 µg/m³2025-12-03: 28.9 µg/m³2025-12-04: 34.6 µg/m³2025-12-05: 36.3 µg/m³2025-12-06: 34.4 µg/m³2025-12-07: 26.5 µg/m³2025-12-08: 32.3 µg/m³2025-12-09: 31.3 µg/m³2025-12-10: 27.5 µg/m³2025-12-11: 34.5 µg/m³2025-12-12: 46.2 µg/m³2025-12-13: 42.5 µg/m³2025-12-14: 31.5 µg/m³2025-12-15: 22.3 µg/m³2025-12-16: 32.7 µg/m³2025-12-17: 32.2 µg/m³2025-12-18: 35.0 µg/m³2025-12-19: 27.4 µg/m³2025-12-20: 32.8 µg/m³2025-12-21: 36.8 µg/m³2025-12-22: 36.4 µg/m³2025-12-23: 28.3 µg/m³2025-12-24: 34.6 µg/m³2025-12-25: 53.9 µg/m³2025-12-26: 29.7 µg/m³2025-12-27: 32.4 µg/m³2025-12-28: 36.3 µg/m³2025-12-29: 33.0 µg/m³2025-12-30: 17.8 µg/m³2025-12-31: 22.6 µg/m³2026-01-01: no data2026-01-02: no data2026-01-03: no data2026-01-04: no data2026-01-05: no data2026-01-06: no data2026-01-07: no data2026-01-08: no data2026-01-09: no data2026-01-10: no data2026-01-11: no data2026-01-12: no data2026-01-13: no data2026-01-14: no data2026-01-15: no data2026-01-16: no data2026-01-17: no data2026-01-18: no data2026-01-19: no data2026-01-20: no data2026-01-21: no data2026-01-22: no data2026-01-23: no data2026-01-24: no data2026-01-25: no data2026-01-26: no data2026-01-27: no data2026-01-28: no data2026-01-29: no data2026-01-30: no data2026-01-31: no data2026-02-01: no data2026-02-02: no data2026-02-03: no data2026-02-04: no data2026-02-05: no data2026-02-06: no data2026-02-07: no data2026-02-08: no data2026-02-09: no data2026-02-10: no data2026-02-11: no data2026-02-12: no data2026-02-13: no data2026-02-14: no data2026-02-15: 37.8 µg/m³2026-02-16: 36.8 µg/m³2026-02-17: 43.0 µg/m³2026-02-18: 38.3 µg/m³2026-02-19: 41.9 µg/m³2026-02-20: 69.4 µg/m³2026-02-21: 31.6 µg/m³2026-02-22: 24.9 µg/m³2026-02-23: 29.0 µg/m³2026-02-24: 35.7 µg/m³2026-02-25: 37.9 µg/m³2026-02-26: 36.5 µg/m³2026-02-27: 40.5 µg/m³2026-02-28: 28.9 µg/m³2026-03-01: no data2026-03-02: no data2026-03-03: no data2026-03-04: 37.2 µg/m³2026-03-05: 34.0 µg/m³2026-03-06: 35.6 µg/m³2026-03-07: 30.5 µg/m³2026-03-08: 34.9 µg/m³2026-03-09: 40.7 µg/m³2026-03-10: 45.6 µg/m³2026-03-11: 50.5 µg/m³2026-03-12: 30.3 µg/m³2026-03-13: 30.8 µg/m³2026-03-14: 26.8 µg/m³2026-03-15: 23.2 µg/m³2026-03-16: 27.7 µg/m³2026-03-17: 26.4 µg/m³2026-03-18: 27.4 µg/m³2026-03-19: 34.0 µg/m³2026-03-20: 26.5 µg/m³2026-03-21: 28.0 µg/m³2026-03-22: 21.6 µg/m³2026-03-23: 23.2 µg/m³2026-03-24: 37.0 µg/m³2026-03-25: 31.3 µg/m³2026-03-26: 32.9 µg/m³2026-03-27: 32.0 µg/m³2026-03-28: 20.9 µg/m³2026-03-29: 21.0 µg/m³2026-03-30: 28.0 µg/m³2026-03-31: 15.1 µg/m³2026-04-01: 21.0 µg/m³2026-04-02: 28.0 µg/m³2026-04-03: 26.3 µg/m³2026-04-04: 25.9 µg/m³2026-04-05: 28.3 µg/m³2026-04-06: 22.3 µg/m³2026-04-07: 30.0 µg/m³2026-04-08: 26.0 µg/m³2026-04-09: 27.3 µg/m³2026-04-10: 23.8 µg/m³2026-04-11: 31.6 µg/m³2026-04-12: 27.5 µg/m³2026-04-13: 27.3 µg/m³2026-04-14: 26.9 µg/m³2026-04-15: 28.6 µg/m³2026-04-16: 38.6 µg/m³2026-04-17: 32.6 µg/m³2026-04-18: 32.3 µg/m³2026-04-19: 32.5 µg/m³2026-04-20: 34.7 µg/m³2026-04-21: 31.5 µg/m³2026-04-22: 34.2 µg/m³2026-04-23: 32.0 µg/m³2026-04-24: 35.3 µg/m³2026-04-25: 39.7 µg/m³2026-04-26: 28.6 µg/m³2026-04-27: 26.3 µg/m³2026-04-28: 30.3 µg/m³2026-04-29: 27.0 µg/m³2026-04-30: 31.8 µg/m³2026-05-01: 38.8 µg/m³2026-05-02: 44.1 µg/m³2026-05-03: 32.5 µg/m³2026-05-04: 36.7 µg/m³2026-05-05: 41.5 µg/m³2026-05-06: 42.1 µg/m³2026-05-07: 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: no data2026-05-29: 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: no data2026-06-20: no data2026-06-21: no data2026-06-22: no data2026-06-23: no data2026-06-24: no data2026-06-25: no data2026-06-26: no data2026-06-27: no data2026-06-28: no data2026-06-29: no data2026-06-30: no data2026-07-01: no data2026-07-02: no data2026-07-03: no data2026-07-04: no data2026-07-05: no data2026-07-06: no data2026-07-07: no data2026-07-08: no data2026-07-09: no data2026-07-10: no data2026-07-11: no data2026-07-12: no data2026-07-13: no data2026-07-14: no data2026-07-15: no data2026-07-16: no data2026-07-17: no data2026-07-18: no data2026-07-19: no data2026-07-20: no data2026-07-21: no data2026-07-22: no data2026-07-23: no data2026-07-24: no data2026-07-25: no data2026-07-26: no data2026-07-27: no data2026-07-28: no data2026-07-29: no data2026-07-30: no data2026-07-31: no data2026-08-01: no data2026-08-02: no data2026-08-03: no data2026-08-04: no data2026-08-05: no data2026-08-06: no data2026-08-07: no data2026-08-08: 27.0 µg/m³2026-08-09: no data2026-08-10: no data2026-08-11: 21.9 µg/m³2026-08-12: 19.0 µg/m³2026-08-13: 28.4 µg/m³2026-08-14: no data2026-08-15: no data2026-08-16: no data2026-08-17: no data2026-08-18: no data2026-08-19: 20.6 µg/m³2026-08-20: 35.4 µg/m³2026-08-21: 23.6 µg/m³2026-08-22: no data2026-08-23: no data2026-08-24: no data2026-08-25: 21.5 µg/m³2026-08-26: 23.3 µg/m³2026-08-27: 26.3 µg/m³2026-08-28: 29.6 µg/m³2026-08-29: 20.6 µg/m³2026-08-30: 26.6 µg/m³2026-08-31: 19.7 µg/m³2026-09-01: 19.5 µg/m³2026-09-02: 18.4 µg/m³2026-09-03: 24.3 µg/m³2026-09-04: 24.0 µg/m³2026-09-05: 17.3 µg/m³2026-09-06: 22.6 µg/m³2026-09-07: 15.3 µg/m³2026-09-08: 14.6 µg/m³2026-09-09: 17.4 µg/m³2026-09-10: 16.3 µg/m³2026-09-11: 28.3 µg/m³2026-09-12: no data2026-09-13: no data2026-09-14: no data2026-09-15: 21.9 µg/m³2026-09-16: 22.8 µg/m³2026-09-17: 14.0 µg/m³2026-09-18: no data2026-09-19: no data2026-09-20: no data2026-09-21: no data2026-09-22: 22.7 µg/m³2026-09-23: 17.8 µg/m³2026-09-24: 20.0 µg/m³2026-09-25: 20.2 µg/m³2026-09-26: 21.3 µg/m³2026-09-27: 20.5 µg/m³2026-09-28: 15.4 µg/m³2026-09-29: 9.3 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

199 of 205 measured days were over the WHO 24-hour guideline.

Daily world rank

#1#879OctNovDecJanFebMarAprMayJunJulAugSep

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

2026 against 2025, month by month

15JanFeb 2026: 38.0 µg/m³FebMar 2025: 35.6 µg/m³Mar 2026: 30.5 µg/m³MarApr 2026: 29.6 µg/m³AprMayJunJul 2025: 21.8 µg/m³JulAug 2025: 21.1 µg/m³Aug 2026: 24.5 µg/m³AugSep 2025: 21.1 µg/m³Sep 2026: 19.3 µg/m³SepOct 2025: 23.8 µg/m³OctNov 2025: 33.3 µg/m³NovDec 2025: 32.9 µg/m³Dec

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

This week against past years

This weekThis week: 17.8 µg/m³17.820252025: 16.6 µg/m³16.6

Mean PM2.5 for 23 Sept to 29 Sept in each year. Dashed line: WHO 24-hour guideline.

Monitors

StationOperatorType
CalimayaMexico 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 31.9Tuxtla 29.4Hacienda Santa Fe 24.4Ciudad Nezahualcoyotl 18.4Santa Anita 18.2Naucalpan de Juárez 18.0Aguascalientes 17.9Guadalajara 17.8Saltillo 17.6Puebla 15.6Parque Industrial Ciudad Mitras 15.3Mexico City 15.1

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

Updated 2026-10-01 05:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.