SmogRank / World / North America / Mexico / Chiapas

Most polluted cities in Chiapas, Mexico

1 measured city, this year; 1 above the WHO annual guideline. The only one: Tuxtla at 30.1 µg/m³, #186 in the world.

Ranked by unhealthy days: the share of each city's measured days with a daily mean over 35.4 µg/m³ (US AQI 101+), Unhealthy for Sensitive Groups or worse on the US EPA's scale. Ties go to the higher average.

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

Estimated: cities without a monitor

Chiapas cities we can't measure, with model estimates for the last 7 days. Listed by population, not ranked: estimates aren't precise enough to rank. Model estimates from the Copernicus Atmosphere Monitoring Service (CAMS), adjusted to measured cities nearby where there are any. Adjusted, a single day lands within ×1.5 of what a monitor would read about two times in three; unadjusted, it can be off by half or double. Treat them as a guide, not a measurement.

City	7-day estimate	Band
Tapachula	≈ 11 µg/m³	Moderate
San Cristóbal de las Casas	≈ 10 µg/m³	Moderate
Comitán	≈ 6 µg/m³	Good
Pijijiapan	≈ 5 µg/m³	Good
Chiapa de Corzo	≈ 11 µg/m³	Moderate
Palenque	≈ 8 µg/m³	Good
Cintalapa de Figueroa	≈ 7 µg/m³	Good
Ocosingo	≈ 5 µg/m³	Good
Ocozocoautla de Espinosa	≈ 11 µg/m³	Moderate
Villaflores	≈ 13 µg/m³	Moderate
Tonalá	≈ 8 µg/m³	Good
Huixtla	≈ 13 µg/m³	Moderate
Berriozábal	≈ 11 µg/m³	Moderate
Reforma	≈ 14 µg/m³	Moderate
Arriaga	≈ 5 µg/m³	Good
Motozintla	≈ 13 µg/m³	Moderate
Las Margaritas	≈ 6 µg/m³	Good
Las Rosas	≈ 10 µg/m³	Moderate
Comalapa	≈ 16 µg/m³	Moderate
Mapastepec	≈ 4 µg/m³	Good
Suchiapa	≈ 11 µg/m³	Moderate
Yajalón	≈ 9 µg/m³	Moderate
Cacahoatán	≈ 26 µg/m³	Moderate
Teopisca	≈ 10 µg/m³	Moderate
Venustiano Carranza	≈ 10 µg/m³	Moderate

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SmogRank, most polluted cities in Chiapas, Mexico, PM2.5, this year to 7 Oct 2026, 01:00 UTC, smogrank.com/mx/region/chiapas?w=year.

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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.

Updated 2026-10-07 01:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.