SmogRank / Mexico / Chiapas / Tuxtla

Tuxtla, month by month

Tuxtla has a measured daily mean on 395 days since 25 April 2024. Its worst month was April 2026, at 96 US AQI (33.1 µg/m³), 194th of 2,941 cities on that month's world ranking. Its cleanest was December 2025, at 72 US AQI (20.3 µg/m³).

Every month since 2024

202690 so far201 days measured188th of 2,791 in the world
Jan17 daysFeb17 daysMar15 daysApr96#194May19 daysJun79#211Jul81#215Aug86#131Sep88#134Oct7 days
2025too few days for a mean (a year needs 256)189 days measured
JannoneFebnoneMar10 daysApr10 daysMay10 daysJun13 daysJul79#144Aug78#141Sep17 daysOct76#245Nov74#368Dec72#495
2024too few days for a mean (a year needs 257)5 days measured
JanFebMarApr2 daysMaynoneJun2 daysJulnoneAugnoneSepnoneOctnoneNov1 dayDecnone
Each square is a month's mean PM2.5 in US AQI from Tuxtla's measured days, with its place on that month's world ranking under it. A month has a mean once 70% of its days are measured, the rule the monthly rankings use; under that, the square gives the days measured. Each square opens that month's ranking with Tuxtla marked; each year, the year's.
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

Months without a mean, and why

21 months
MonthWhy
Oct 20267 of 11 days measured; a month needs 8. The others: 4 with readings for part of the day (a day needs 18 hours).
May 202619 of 31 days measured; a month needs 22. The others: 12 with under 18 hours of readings or readings that failed our checks.
Mar 202615 of 31 days measured; a month needs 22. The others: 16 with under 18 hours of readings or readings that failed our checks.
Feb 202617 of 28 days measured; a month needs 20. The others: 11 with under 18 hours of readings or readings that failed our checks.
Jan 202617 of 31 days measured; a month needs 22. The others: 14 with under 18 hours of readings or readings that failed our checks.
Sep 202517 of 30 days measured; a month needs 21. The others: 13 with under 18 hours of readings or readings that failed our checks.
Jun 202513 of 30 days measured; a month needs 21. The others: 17 with under 18 hours of readings or readings that failed our checks.
May 202510 of 31 days measured; a month needs 22. The others: 21 with under 18 hours of readings or readings that failed our checks.
Apr 202510 of 30 days measured; a month needs 21. The others: 20 with under 18 hours of readings or readings that failed our checks.
Mar 202510 of 31 days measured; a month needs 22. The others: 21 with under 18 hours of readings or readings that failed our checks.
Feb 2025No day measured. The others: 28 with under 18 hours of readings or readings that failed our checks.
Jan 2025No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Dec 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Nov 20241 of 30 days measured; a month needs 21. The others: 29 with under 18 hours of readings or readings that failed our checks.
Oct 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Sep 2024No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Aug 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Jul 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Jun 20242 of 30 days measured; a month needs 21. The others: 28 with under 18 hours of readings or readings that failed our checks.
May 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Apr 20242 of 30 days measured; a month needs 21. The others: 4 with under 18 hours of readings or readings that failed our checks.

A day counts once 18 hours of it are measured; a month needs 70% of its days.

Tuxtla's worst months

MonthUS AQIDays measuredWorld rank
April 2026 9633.1 µg/m³25 of 30194thof 2,941
September 2026 8829.1 µg/m³25 of 30134thof 2,981
August 2026 8627.9 µg/m³29 of 31131stof 2,896
July 2026 8125.2 µg/m³26 of 31215thof 2,784
July 2025 7924.3 µg/m³30 of 31144thof 2,889
June 2026 7924.2 µg/m³21 of 30211thof 2,497

Monthly means over the days measured; finished months only. World rank: its place on that month's world ranking of every city with enough days. Each month opens that ranking.

Tuxtla's worst days

DayUS AQI
19 Feb 2026 188108.0 µg/m³
18 Feb 2026 17792.2 µg/m³
17 Feb 2026 17184.6 µg/m³
28 Feb 2026 16981.7 µg/m³
1 Mar 2026 15865.9 µg/m³
2 Mar 2026 15663.3 µg/m³
16 Feb 2026 15662.8 µg/m³
1 Jun 2025 15662.7 µg/m³
23 May 2025 15662.5 µg/m³
16 May 2026 15257.5 µg/m³

Daily means, the highest since 25 Apr 2024; the WHO's daily guideline is 15 µg/m³. Each date opens that day's world ranking, and each episode the bad-air spell it was part of.

Use this history

SmogRank, PM2.5 monthly and daily means, Tuxtla, Mexico, 25 Apr 2024 – 11 Oct 2026. Monitor data from Sinaica Mexico via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/mx/tuxtla/history (accessed 12 Oct 2026).

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You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.

Tuxtla now: the last 24 hours, its ranks today and the last 12 months day by day.

Updated 2026-10-12 17:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index. Some low-cost readings: Sensor.Community, ODbL (data and licence). Some readings: Uzhydromet (Uzbekistan's Hydrometeorological Service); Department of Environment, Nepal; Vietnam's government monitors; Aurassure; Umhverfisstofnun (Environment Agency of Iceland); RMCAB (Secretaría Distrital de Ambiente, Bogotá); Love My Air (City and County of Denver), no reuse terms published (why we use them).