SmogRank / Mexico / Baja California

Air quality in Mexicali

Baja California, Mexico. PM2.5 from 1 reference monitor, updated hourly.

14.0 µg/m³
Moderate

Latest hour (04:00 UTC), 0.9× the WHO 24-hour guideline.

Rank

24 h
–
not enough data
7 days
#281
of 2,330 · 13.8 µg/m³
30 days
#330
of 2,327 · 11.5 µg/m³
Year
#297
of 2,160 · 15.9 µg/m³

Why it ranks here

Seasonal. Over the past year its worst months were December, averaging up to 45.9 µg/m³ against 9.7 in its cleanest month. Seasonal peaks usually come from heating, crop burning, fire or dust seasons.

Based on Mexicali's own measurements; causes are the usual kinds for a pattern like this, not a confirmed source.

Last 4 days, hour by hour

15302026-10-01 00:00 UTC: 5.0 µg/m³2026-10-01 01:00 UTC: 5.0 µg/m³2026-10-01 02:00 UTC: 10.0 µg/m³2026-10-01 03:00 UTC: 14.0 µg/m³2026-10-01 04:00 UTC: 14.0 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: no data2025-09-30: no data2025-10-01: no data2025-10-02: no data2025-10-03: no data2025-10-04: no data2025-10-05: no data2025-10-06: no data2025-10-07: no data2025-10-08: no data2025-10-09: no data2025-10-10: no data2025-10-11: no data2025-10-12: no data2025-10-13: no data2025-10-14: no data2025-10-15: no data2025-10-16: no data2025-10-17: no data2025-10-18: no data2025-10-19: no data2025-10-20: no data2025-10-21: no data2025-10-22: no data2025-10-23: no data2025-10-24: no data2025-10-25: no data2025-10-26: no data2025-10-27: no data2025-10-28: no data2025-10-29: no data2025-10-30: no data2025-10-31: no data2025-11-01: no data2025-11-02: no data2025-11-03: no data2025-11-04: no data2025-11-05: no data2025-11-06: no data2025-11-07: no data2025-11-08: no data2025-11-09: no data2025-11-10: no data2025-11-11: 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: no data2025-11-22: no data2025-11-23: 20.5 µg/m³2025-11-24: 35.0 µg/m³2025-11-25: 44.3 µg/m³2025-11-26: 44.3 µg/m³2025-11-27: 50.8 µg/m³2025-11-28: 56.3 µg/m³2025-11-29: 67.8 µg/m³2025-11-30: 46.9 µg/m³2025-12-01: 46.1 µg/m³2025-12-02: 42.8 µg/m³2025-12-03: 21.0 µg/m³2025-12-04: 43.6 µg/m³2025-12-05: 81.1 µg/m³2025-12-06: 91.5 µg/m³2025-12-07: 76.4 µg/m³2025-12-08: no data2025-12-09: 52.0 µg/m³2025-12-10: 54.1 µg/m³2025-12-11: 64.3 µg/m³2025-12-12: 46.0 µg/m³2025-12-13: 58.8 µg/m³2025-12-14: 59.0 µg/m³2025-12-15: 62.8 µg/m³2025-12-16: 112.0 µg/m³2025-12-17: 66.0 µg/m³2025-12-18: 49.9 µg/m³2025-12-19: 52.3 µg/m³2025-12-20: 28.2 µg/m³2025-12-21: 49.3 µg/m³2025-12-22: 40.4 µg/m³2025-12-23: 34.8 µg/m³2025-12-24: 15.5 µg/m³2025-12-25: 21.6 µg/m³2025-12-26: 34.6 µg/m³2025-12-27: 13.6 µg/m³2025-12-28: 21.5 µg/m³2025-12-29: 8.5 µg/m³2025-12-30: 11.3 µg/m³2025-12-31: 17.7 µg/m³2026-01-01: 35.6 µg/m³2026-01-02: 21.4 µg/m³2026-01-03: 40.1 µg/m³2026-01-04: 37.1 µg/m³2026-01-05: 15.8 µg/m³2026-01-06: 18.0 µg/m³2026-01-07: 20.8 µg/m³2026-01-08: 10.4 µg/m³2026-01-09: 10.7 µg/m³2026-01-10: 30.7 µg/m³2026-01-11: 18.5 µg/m³2026-01-12: 20.7 µg/m³2026-01-13: 27.6 µg/m³2026-01-14: 28.8 µg/m³2026-01-15: 38.3 µg/m³2026-01-16: 33.0 µg/m³2026-01-17: 36.5 µg/m³2026-01-18: 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: 26.6 µg/m³2026-01-27: 30.5 µg/m³2026-01-28: 30.8 µg/m³2026-01-29: 23.1 µg/m³2026-01-30: 32.8 µg/m³2026-01-31: 38.3 µg/m³2026-02-01: 40.5 µg/m³2026-02-02: 51.5 µg/m³2026-02-03: 38.9 µg/m³2026-02-04: 25.5 µg/m³2026-02-05: no data2026-02-06: 36.8 µg/m³2026-02-07: no data2026-02-08: no data2026-02-09: no data2026-02-10: 24.9 µg/m³2026-02-11: no data2026-02-12: 14.2 µg/m³2026-02-13: 12.8 µg/m³2026-02-14: 25.0 µg/m³2026-02-15: 12.5 µg/m³2026-02-16: 13.2 µg/m³2026-02-17: 6.9 µg/m³2026-02-18: 14.6 µg/m³2026-02-19: 6.1 µg/m³2026-02-20: 15.3 µg/m³2026-02-21: 30.5 µg/m³2026-02-22: 19.4 µg/m³2026-02-23: 30.8 µg/m³2026-02-24: 54.3 µg/m³2026-02-25: 36.2 µg/m³2026-02-26: no data2026-02-27: 28.8 µg/m³2026-02-28: 24.6 µg/m³2026-03-01: no data2026-03-02: 7.8 µg/m³2026-03-03: 18.4 µg/m³2026-03-04: 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: 20.8 µg/m³2026-03-14: 34.6 µg/m³2026-03-15: 31.1 µg/m³2026-03-16: 16.8 µg/m³2026-03-17: 23.0 µg/m³2026-03-18: 27.9 µg/m³2026-03-19: 40.0 µg/m³2026-03-20: 24.3 µg/m³2026-03-21: 10.2 µg/m³2026-03-22: 9.5 µg/m³2026-03-23: 10.8 µg/m³2026-03-24: 21.0 µg/m³2026-03-25: 23.2 µg/m³2026-03-26: 27.5 µg/m³2026-03-27: 39.1 µg/m³2026-03-28: 25.6 µg/m³2026-03-29: 20.2 µg/m³2026-03-30: 37.7 µg/m³2026-03-31: 18.7 µg/m³2026-04-01: 14.7 µg/m³2026-04-02: 13.8 µg/m³2026-04-03: 18.4 µg/m³2026-04-04: 20.3 µg/m³2026-04-05: 21.8 µg/m³2026-04-06: 18.7 µg/m³2026-04-07: 19.3 µg/m³2026-04-08: 27.6 µg/m³2026-04-09: 15.1 µg/m³2026-04-10: 7.9 µg/m³2026-04-11: 5.5 µg/m³2026-04-12: 5.5 µg/m³2026-04-13: 5.3 µg/m³2026-04-14: 9.8 µg/m³2026-04-15: 20.2 µg/m³2026-04-16: 13.0 µg/m³2026-04-17: 16.5 µg/m³2026-04-18: 17.4 µg/m³2026-04-19: 13.0 µg/m³2026-04-20: 12.0 µg/m³2026-04-21: 14.8 µg/m³2026-04-22: 4.8 µg/m³2026-04-23: 12.4 µg/m³2026-04-24: 20.7 µg/m³2026-04-25: 11.5 µg/m³2026-04-26: 6.7 µg/m³2026-04-27: 6.8 µg/m³2026-04-28: 11.5 µg/m³2026-04-29: 15.9 µg/m³2026-04-30: 17.2 µg/m³2026-05-01: 16.5 µg/m³2026-05-02: 15.2 µg/m³2026-05-03: 18.9 µg/m³2026-05-04: 9.8 µg/m³2026-05-05: 5.4 µg/m³2026-05-06: 10.9 µg/m³2026-05-07: 22.2 µg/m³2026-05-08: 13.7 µg/m³2026-05-09: 14.1 µg/m³2026-05-10: 16.2 µg/m³2026-05-11: 16.8 µg/m³2026-05-12: 9.5 µg/m³2026-05-13: 13.8 µg/m³2026-05-14: 13.0 µg/m³2026-05-15: 13.8 µg/m³2026-05-16: 14.3 µg/m³2026-05-17: 14.5 µg/m³2026-05-18: 16.0 µg/m³2026-05-19: 16.2 µg/m³2026-05-20: 16.9 µg/m³2026-05-21: 17.0 µg/m³2026-05-22: 15.2 µg/m³2026-05-23: 11.7 µg/m³2026-05-24: 11.8 µg/m³2026-05-25: 11.3 µg/m³2026-05-26: 14.8 µg/m³2026-05-27: 10.2 µg/m³2026-05-28: 7.1 µg/m³2026-05-29: 5.7 µg/m³2026-05-30: 8.4 µg/m³2026-05-31: 16.4 µg/m³2026-06-01: 11.4 µg/m³2026-06-02: 16.6 µg/m³2026-06-03: 16.5 µg/m³2026-06-04: 13.3 µg/m³2026-06-05: 11.0 µg/m³2026-06-06: 11.3 µg/m³2026-06-07: 11.3 µg/m³2026-06-08: 11.5 µg/m³2026-06-09: 13.0 µg/m³2026-06-10: 12.2 µg/m³2026-06-11: 13.0 µg/m³2026-06-12: 11.7 µg/m³2026-06-13: 10.3 µg/m³2026-06-14: 9.4 µg/m³2026-06-15: 10.8 µg/m³2026-06-16: 17.0 µg/m³2026-06-17: 13.8 µg/m³2026-06-18: 13.2 µg/m³2026-06-19: 9.9 µg/m³2026-06-20: 11.5 µg/m³2026-06-21: 13.1 µg/m³2026-06-22: 11.5 µg/m³2026-06-23: 10.1 µg/m³2026-06-24: 13.0 µg/m³2026-06-25: 11.4 µg/m³2026-06-26: 14.7 µg/m³2026-06-27: 12.3 µg/m³2026-06-28: 8.6 µg/m³2026-06-29: 7.5 µg/m³2026-06-30: 9.5 µg/m³2026-07-01: 11.3 µg/m³2026-07-02: 11.3 µg/m³2026-07-03: no data2026-07-04: no data2026-07-05: no data2026-07-06: no data2026-07-07: no data2026-07-08: no data2026-07-09: 10.6 µg/m³2026-07-10: 13.6 µg/m³2026-07-11: 10.4 µg/m³2026-07-12: 8.0 µg/m³2026-07-13: 8.0 µg/m³2026-07-14: 9.4 µg/m³2026-07-15: 9.6 µg/m³2026-07-16: 8.4 µg/m³2026-07-17: 9.0 µg/m³2026-07-18: 9.4 µg/m³2026-07-19: 8.5 µg/m³2026-07-20: 8.2 µg/m³2026-07-21: 8.3 µg/m³2026-07-22: 9.5 µg/m³2026-07-23: 9.9 µg/m³2026-07-24: 8.8 µg/m³2026-07-25: 10.6 µg/m³2026-07-26: 9.0 µg/m³2026-07-27: 8.6 µg/m³2026-07-28: 10.7 µg/m³2026-07-29: 10.2 µg/m³2026-07-30: 10.5 µg/m³2026-07-31: 9.8 µg/m³2026-08-01: 13.2 µg/m³2026-08-02: 10.0 µg/m³2026-08-03: 8.3 µg/m³2026-08-04: 11.0 µg/m³2026-08-05: 10.0 µg/m³2026-08-06: 17.7 µg/m³2026-08-07: 10.7 µg/m³2026-08-08: 12.0 µg/m³2026-08-09: 10.6 µg/m³2026-08-10: 11.9 µg/m³2026-08-11: 10.3 µg/m³2026-08-12: 10.4 µg/m³2026-08-13: 9.0 µg/m³2026-08-14: 8.4 µg/m³2026-08-15: 9.9 µg/m³2026-08-16: 8.7 µg/m³2026-08-17: 8.0 µg/m³2026-08-18: 9.3 µg/m³2026-08-19: 8.6 µg/m³2026-08-20: 11.8 µg/m³2026-08-21: 29.3 µg/m³2026-08-22: 20.4 µg/m³2026-08-23: no data2026-08-24: no data2026-08-25: no data2026-08-26: no data2026-08-27: no data2026-08-28: no data2026-08-29: no data2026-08-30: no data2026-08-31: no data2026-09-01: no data2026-09-02: 7.6 µg/m³2026-09-03: 11.4 µg/m³2026-09-04: 15.9 µg/m³2026-09-05: 17.7 µg/m³2026-09-06: 7.6 µg/m³2026-09-07: 7.6 µg/m³2026-09-08: 8.5 µg/m³2026-09-09: 8.3 µg/m³2026-09-10: 9.3 µg/m³2026-09-11: 9.1 µg/m³2026-09-12: 7.0 µg/m³2026-09-13: 6.4 µg/m³2026-09-14: 8.8 µg/m³2026-09-15: 9.2 µg/m³2026-09-16: 9.8 µg/m³2026-09-17: 8.8 µg/m³2026-09-18: 10.5 µg/m³2026-09-19: 14.5 µg/m³2026-09-20: 22.4 µg/m³2026-09-21: 9.0 µg/m³2026-09-22: 16.0 µg/m³2026-09-23: 19.2 µg/m³2026-09-24: 19.0 µg/m³2026-09-25: 20.5 µg/m³2026-09-26: 11.6 µg/m³2026-09-27: 11.7 µg/m³2026-09-28: 5.5 µg/m³2026-09-29: 9.1 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

126 of 270 measured days were over the WHO 24-hour guideline.

Daily world rank

#1#1867DecJanFebMarAprMayJunJulAugSep

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

2026 against 2025, month by month

15Jan 2026: 27.2 µg/m³JanFeb 2026: 25.6 µg/m³FebMar 2026: 23.2 µg/m³MarApr 2026: 13.9 µg/m³AprMay 2026: 13.5 µg/m³MayJun 2026: 12.0 µg/m³JunJul 2026: 9.7 µg/m³JulAug 2025: 6.6 µg/m³Aug 2026: 11.8 µg/m³AugSep 2026: 11.5 µg/m³SepOctNovDec 2025: 45.9 µg/m³Dec

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

Monitors

StationOperatorType
Comandancia AnáhuacMexico 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 24.4San Salvador Tizatlalli 19.3Ciudad Nezahualcoyotl 18.4Santa Anita 18.2Naucalpan de Juárez 18.0Aguascalientes 17.9Guadalajara 17.8Saltillo 17.6Puebla 15.6Parque Industrial Ciudad Mitras 15.3

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.