SmogRank / Mexico / Nuevo León

Air quality in Santa Catarina

Nuevo León, Mexico. PM2.5 from 2 reference monitors, updated hourly.

7.5µg/m³
Good

Latest hour (20:00 UTC), 0.5× the WHO 24-hour guideline.

Rank, worst first

24 hours–not enough data
7 days#774of 2,315, at 8.5 µg/m³
30 days#295of 2,323, at 12.5 µg/m³
This year#262of 2,174, at 17.5 µg/m³

Why it ranks here

Cleaner than usual. The last 7 days averaged 8.5 µg/m³, well below its typical 17.8; rain or wind often clears the air for a while.

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

The last 12 months, day by day

1102031Oct 2025NovDecJan 2026FebMarAprMayJunJulAugSep2025-10-01: 19.1 µg/m³2025-10-02: 15.7 µg/m³2025-10-03: 16.9 µg/m³2025-10-04: 15.3 µg/m³2025-10-05: 13.0 µg/m³2025-10-06: 18.6 µg/m³2025-10-07: 20.7 µg/m³2025-10-08: 15.9 µg/m³2025-10-09: 18.6 µg/m³2025-10-10: 18.2 µg/m³2025-10-11: no data2025-10-12: 12.4 µg/m³2025-10-13: 22.1 µg/m³2025-10-14: 14.9 µg/m³2025-10-15: 14.8 µg/m³2025-10-16: no data2025-10-17: 21.4 µg/m³2025-10-18: 30.8 µg/m³2025-10-19: 22.9 µg/m³2025-10-20: 24.9 µg/m³2025-10-21: 28.9 µg/m³2025-10-22: 24.6 µg/m³2025-10-23: 23.7 µg/m³2025-10-24: 21.9 µg/m³2025-10-25: 29.5 µg/m³2025-10-26: no data2025-10-27: 23.9 µg/m³2025-10-28: 20.5 µg/m³2025-10-29: 9.3 µg/m³2025-10-30: 14.2 µg/m³2025-10-31: 21.4 µg/m³2025-11-01: 24.1 µg/m³2025-11-02: 14.2 µg/m³2025-11-03: 19.8 µg/m³2025-11-04: 19.0 µg/m³2025-11-05: 26.4 µg/m³2025-11-06: 23.9 µg/m³2025-11-07: 20.4 µg/m³2025-11-08: 18.8 µg/m³2025-11-09: 14.0 µg/m³2025-11-10: 7.5 µg/m³2025-11-11: 17.1 µg/m³2025-11-12: 26.5 µg/m³2025-11-13: 22.2 µg/m³2025-11-14: 22.5 µg/m³2025-11-15: 29.5 µg/m³2025-11-16: 27.3 µg/m³2025-11-17: 26.2 µg/m³2025-11-18: 38.5 µg/m³2025-11-19: 40.3 µg/m³2025-11-20: 35.8 µg/m³2025-11-21: 33.8 µg/m³2025-11-22: 35.2 µg/m³2025-11-23: 31.7 µg/m³2025-11-24: 27.3 µg/m³2025-11-25: 20.6 µg/m³2025-11-26: no data2025-11-27: 23.9 µg/m³2025-11-28: 12.6 µg/m³2025-11-29: 33.1 µg/m³2025-11-30: no data2025-12-01: 35.1 µg/m³2025-12-02: 24.4 µg/m³2025-12-03: 52.8 µg/m³2025-12-04: 26.2 µg/m³2025-12-05: 24.0 µg/m³2025-12-06: 40.5 µg/m³2025-12-07: 26.0 µg/m³2025-12-08: 10.2 µg/m³2025-12-09: 22.0 µg/m³2025-12-10: 17.0 µg/m³2025-12-11: 13.0 µg/m³2025-12-12: 21.8 µg/m³2025-12-13: 24.2 µg/m³2025-12-14: 24.0 µg/m³2025-12-15: 10.0 µg/m³2025-12-16: 33.3 µg/m³2025-12-17: 34.7 µg/m³2025-12-18: 21.7 µg/m³2025-12-19: 12.6 µg/m³2025-12-20: 26.5 µg/m³2025-12-21: 17.8 µg/m³2025-12-22: 17.3 µg/m³2025-12-23: 17.7 µg/m³2025-12-24: 16.5 µg/m³2025-12-25: 25.1 µg/m³2025-12-26: 15.1 µg/m³2025-12-27: 19.3 µg/m³2025-12-28: 21.8 µg/m³2025-12-29: 8.5 µg/m³2025-12-30: 8.3 µg/m³2025-12-31: 22.1 µg/m³2026-01-01: 36.4 µg/m³2026-01-02: 16.8 µg/m³2026-01-03: 12.1 µg/m³2026-01-04: 9.1 µg/m³2026-01-05: 20.0 µg/m³2026-01-06: 25.2 µg/m³2026-01-07: 30.1 µg/m³2026-01-08: 38.4 µg/m³2026-01-09: 31.4 µg/m³2026-01-10: 10.3 µg/m³2026-01-11: 6.0 µg/m³2026-01-12: 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: 19.3 µg/m³2026-01-23: 27.4 µg/m³2026-01-24: 26.4 µg/m³2026-01-25: 17.4 µg/m³2026-01-26: 14.2 µg/m³2026-01-27: 12.3 µg/m³2026-01-28: 23.5 µg/m³2026-01-29: 24.5 µg/m³2026-01-30: 7.9 µg/m³2026-01-31: 9.0 µg/m³2026-02-01: 14.5 µg/m³2026-02-02: 12.8 µg/m³2026-02-03: 21.3 µg/m³2026-02-04: 10.6 µg/m³2026-02-05: 10.6 µg/m³2026-02-06: 19.1 µg/m³2026-02-07: 19.6 µg/m³2026-02-08: 17.6 µg/m³2026-02-09: 17.8 µg/m³2026-02-10: 23.7 µg/m³2026-02-11: 23.5 µg/m³2026-02-12: 20.8 µg/m³2026-02-13: 24.7 µg/m³2026-02-14: 20.3 µg/m³2026-02-15: 8.3 µg/m³2026-02-16: 11.5 µg/m³2026-02-17: 21.6 µg/m³2026-02-18: 23.4 µg/m³2026-02-19: 22.0 µg/m³2026-02-20: 34.2 µg/m³2026-02-21: 29.0 µg/m³2026-02-22: 6.1 µg/m³2026-02-23: 7.1 µg/m³2026-02-24: 16.2 µg/m³2026-02-25: 19.4 µg/m³2026-02-26: 12.1 µg/m³2026-02-27: 17.5 µg/m³2026-02-28: 30.0 µg/m³2026-03-01: 27.9 µg/m³2026-03-02: 26.2 µg/m³2026-03-03: 24.4 µg/m³2026-03-04: 21.0 µg/m³2026-03-05: 17.4 µg/m³2026-03-06: 20.0 µg/m³2026-03-07: 27.1 µg/m³2026-03-08: 17.2 µg/m³2026-03-09: 30.3 µg/m³2026-03-10: 29.2 µg/m³2026-03-11: 13.2 µg/m³2026-03-12: 10.0 µg/m³2026-03-13: 18.3 µg/m³2026-03-14: 18.6 µg/m³2026-03-15: 12.8 µg/m³2026-03-16: 20.9 µg/m³2026-03-17: 7.7 µg/m³2026-03-18: 16.7 µg/m³2026-03-19: 17.4 µg/m³2026-03-20: 16.1 µg/m³2026-03-21: 14.4 µg/m³2026-03-22: 10.7 µg/m³2026-03-23: 12.0 µg/m³2026-03-24: 14.5 µg/m³2026-03-25: 17.3 µg/m³2026-03-26: 17.2 µg/m³2026-03-27: 19.3 µg/m³2026-03-28: 12.4 µg/m³2026-03-29: 10.1 µg/m³2026-03-30: 13.4 µg/m³2026-03-31: 15.6 µg/m³2026-04-01: 20.4 µg/m³2026-04-02: 20.3 µg/m³2026-04-03: 17.4 µg/m³2026-04-04: 21.2 µg/m³2026-04-05: no data2026-04-06: 10.7 µg/m³2026-04-07: 10.7 µg/m³2026-04-08: 9.4 µg/m³2026-04-09: 9.6 µg/m³2026-04-10: 10.0 µg/m³2026-04-11: 6.9 µg/m³2026-04-12: 14.4 µg/m³2026-04-13: 12.3 µg/m³2026-04-14: 16.1 µg/m³2026-04-15: 23.1 µg/m³2026-04-16: 19.8 µg/m³2026-04-17: 20.0 µg/m³2026-04-18: 21.2 µg/m³2026-04-19: no data2026-04-20: no data2026-04-21: no data2026-04-22: no data2026-04-23: 21.0 µg/m³2026-04-24: 26.7 µg/m³2026-04-25: 30.6 µg/m³2026-04-26: 27.2 µg/m³2026-04-27: 32.4 µg/m³2026-04-28: 35.0 µg/m³2026-04-29: 35.8 µg/m³2026-04-30: 26.8 µg/m³2026-05-01: 10.4 µg/m³2026-05-02: 5.8 µg/m³2026-05-03: 5.8 µg/m³2026-05-04: 11.8 µg/m³2026-05-05: 17.4 µg/m³2026-05-06: 25.3 µg/m³2026-05-07: 31.5 µg/m³2026-05-08: 17.8 µg/m³2026-05-09: 14.6 µg/m³2026-05-10: 15.7 µg/m³2026-05-11: 10.3 µg/m³2026-05-12: 8.3 µg/m³2026-05-13: 12.6 µg/m³2026-05-14: 13.1 µg/m³2026-05-15: 15.8 µg/m³2026-05-16: 15.2 µg/m³2026-05-17: 24.3 µg/m³2026-05-18: 31.5 µg/m³2026-05-19: 29.8 µg/m³2026-05-20: 16.7 µg/m³2026-05-21: 14.5 µg/m³2026-05-22: 12.9 µg/m³2026-05-23: 12.3 µg/m³2026-05-24: 11.1 µg/m³2026-05-25: 12.3 µg/m³2026-05-26: 15.6 µg/m³2026-05-27: 18.6 µg/m³2026-05-28: 15.9 µg/m³2026-05-29: 13.6 µg/m³2026-05-30: 14.7 µg/m³2026-05-31: 11.8 µg/m³2026-06-01: 11.6 µg/m³2026-06-02: 20.4 µg/m³2026-06-03: 14.3 µg/m³2026-06-04: 11.5 µg/m³2026-06-05: 10.3 µg/m³2026-06-06: 14.4 µg/m³2026-06-07: 15.3 µg/m³2026-06-08: 16.0 µg/m³2026-06-09: 9.8 µg/m³2026-06-10: 9.6 µg/m³2026-06-11: 10.9 µg/m³2026-06-12: 10.3 µg/m³2026-06-13: 9.3 µg/m³2026-06-14: 13.1 µg/m³2026-06-15: 10.9 µg/m³2026-06-16: no data2026-06-17: 13.6 µg/m³2026-06-18: 12.5 µg/m³2026-06-19: 20.0 µg/m³2026-06-20: 19.0 µg/m³2026-06-21: 17.9 µg/m³2026-06-22: 23.1 µg/m³2026-06-23: 16.1 µg/m³2026-06-24: 16.1 µg/m³2026-06-25: 15.7 µg/m³2026-06-26: 18.9 µg/m³2026-06-27: 23.5 µg/m³2026-06-28: 14.5 µg/m³2026-06-29: 17.3 µg/m³2026-06-30: 24.0 µg/m³2026-07-01: 22.1 µg/m³2026-07-02: 17.5 µg/m³2026-07-03: 16.7 µg/m³2026-07-04: 17.2 µg/m³2026-07-05: 16.2 µg/m³2026-07-06: 18.7 µg/m³2026-07-07: 17.6 µg/m³2026-07-08: 15.9 µg/m³2026-07-09: 11.5 µg/m³2026-07-10: 11.6 µg/m³2026-07-11: 21.3 µg/m³2026-07-12: 17.6 µg/m³2026-07-13: 15.9 µg/m³2026-07-14: 25.5 µg/m³2026-07-15: 26.9 µg/m³2026-07-16: 16.9 µg/m³2026-07-17: 17.8 µg/m³2026-07-18: 26.2 µg/m³2026-07-19: 25.2 µg/m³2026-07-20: 29.7 µg/m³2026-07-21: 24.5 µg/m³2026-07-22: 24.1 µg/m³2026-07-23: 24.7 µg/m³2026-07-24: 19.6 µg/m³2026-07-25: 21.8 µg/m³2026-07-26: 16.7 µg/m³2026-07-27: 19.7 µg/m³2026-07-28: 20.5 µg/m³2026-07-29: 26.0 µg/m³2026-07-30: 23.3 µg/m³2026-07-31: 19.4 µg/m³2026-08-01: 14.8 µg/m³2026-08-02: 15.6 µg/m³2026-08-03: 19.9 µg/m³2026-08-04: 30.0 µg/m³2026-08-05: 21.6 µg/m³2026-08-06: 17.3 µg/m³2026-08-07: 16.0 µg/m³2026-08-08: no data2026-08-09: no data2026-08-10: no data2026-08-11: 15.5 µg/m³2026-08-12: 14.4 µg/m³2026-08-13: 18.6 µg/m³2026-08-14: 16.7 µg/m³2026-08-15: 20.0 µg/m³2026-08-16: 19.7 µg/m³2026-08-17: 17.1 µg/m³2026-08-18: 17.6 µg/m³2026-08-19: 18.7 µg/m³2026-08-20: 17.4 µg/m³2026-08-21: 23.3 µg/m³2026-08-22: 23.4 µg/m³2026-08-23: 19.6 µg/m³2026-08-24: 18.9 µg/m³2026-08-25: 17.6 µg/m³2026-08-26: 23.0 µg/m³2026-08-27: 19.0 µg/m³2026-08-28: 15.0 µg/m³2026-08-29: 14.7 µg/m³2026-08-30: 14.6 µg/m³2026-08-31: 24.0 µg/m³2026-09-01: 17.6 µg/m³2026-09-02: 16.0 µg/m³2026-09-03: 19.1 µg/m³2026-09-04: 19.6 µg/m³2026-09-05: 16.5 µg/m³2026-09-06: 18.2 µg/m³2026-09-07: 13.6 µg/m³2026-09-08: 12.5 µg/m³2026-09-09: 10.1 µg/m³2026-09-10: 13.1 µg/m³2026-09-11: 16.0 µg/m³2026-09-12: 18.1 µg/m³2026-09-13: 13.2 µg/m³2026-09-14: 10.4 µg/m³2026-09-15: 18.3 µg/m³2026-09-16: 21.5 µg/m³2026-09-17: 14.6 µg/m³2026-09-18: 9.5 µg/m³2026-09-19: 7.2 µg/m³2026-09-20: 8.5 µg/m³2026-09-21: 9.1 µg/m³2026-09-22: 5.8 µg/m³2026-09-23: 6.7 µg/m³2026-09-24: 6.2 µg/m³2026-09-25: 5.6 µg/m³2026-09-26: 7.1 µg/m³2026-09-27: 7.9 µg/m³2026-09-28: 7.8 µg/m³2026-09-29: 8.0 µg/m³2026-09-30: 16.7 µg/m³
231 of 341 measured days were over the WHO 24-hour guideline (15 µg/m³). One row per month, one square per local day.
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+

Last 4 days, hour by hour

15302026-09-30 21:00 UTC: 21.9 µg/m³2026-10-01 11:00 UTC: 10.5 µg/m³2026-10-01 12:00 UTC: 11.0 µg/m³2026-10-01 13:00 UTC: 11.8 µg/m³2026-10-01 14:00 UTC: 12.5 µg/m³2026-10-01 16:00 UTC: 10.8 µg/m³2026-10-01 18:00 UTC: 13.8 µg/m³2026-10-01 19:00 UTC: 9.4 µg/m³2026-10-01 20:00 UTC: 7.5 µg/m³Sep 28Sep 29Sep 30Oct 1
Times in UTC. Dashed line: WHO 24-hour guideline (15 µg/m³).

Its world rank, day by day

#1#1623OctNovDecJanFebMarAprMayJunJulAugSep
Rank on each day's board (1 = most polluted city that day).

2026 against 2025, month by month

15Jan 2026: 19.9 µg/m³JanFeb 2026: 18.4 µg/m³FebMar 2025: 22.3 µg/m³Mar 2026: 17.7 µg/m³MarApr 2025: 17.5 µg/m³Apr 2026: 20.0 µg/m³AprMay 2025: 23.6 µg/m³May 2026: 15.7 µg/m³MayJun 2025: 15.4 µg/m³Jun 2026: 15.2 µg/m³JunJul 2025: 17.7 µg/m³Jul 2026: 20.3 µg/m³JulAug 2025: 16.8 µg/m³Aug 2026: 18.7 µg/m³AugSep 2025: 19.8 µg/m³Sep 2026: 12.5 µg/m³SepOct 2025: 19.8 µg/m³OctNov 2025: 24.7 µg/m³NovDec 2025: 22.2 µg/m³Dec
Faded bars: 2025. A month shows once it has 10 measured days.

This week against past years

This weekThis week: 8.5 µg/m³8.520252025: 29.5 µg/m³29.52024no data20232023: 17.9 µg/m³17.9
Mean PM2.5 for 24 Sept to 30 Sept in each year. Dashed line: WHO 24-hour guideline.

Monitors

StationOperatorType
San PedroMexico SINAICA Terms and ConditionsSinaica MexicoReference
Santa CatarinaMexico 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

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

Updated 2026-10-01 21:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.