SmogRank / World / North America / Mexico / México

Most polluted cities in México, Mexico

2 measured cities, this year; 2 above the WHO annual guideline. Worst: Naucalpan de Juárez at 22.3 µg/m³, #315 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

México 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
Tlalnepantla	≈ 13 µg/m³	Moderate
Cuautitlán Izcalli	≈ 13 µg/m³	Moderate
Toluca	≈ 7 µg/m³	Good
Ciudad López Mateos	≈ 13 µg/m³	Moderate
Ojo de Agua	≈ 13 µg/m³	Moderate
Xico	≈ 10 µg/m³	Moderate
Ixtapaluca	≈ 10 µg/m³	Moderate
Nicolás Romero	≈ 13 µg/m³	Moderate
Zumpango	≈ 13 µg/m³	Moderate
Coacalco	≈ 13 µg/m³	Moderate
Buenavista	≈ 13 µg/m³	Moderate
Cuautitlán	≈ 13 µg/m³	Moderate
Chicoloapan	≈ 12 µg/m³	Moderate
Chalco	≈ 10 µg/m³	Moderate
San Pablo de las Salinas	≈ 13 µg/m³	Moderate
Huixquilucan	≈ 11 µg/m³	Moderate
Texcoco de Mora	≈ 12 µg/m³	Moderate
Tepexpan	≈ 12 µg/m³	Moderate
Los Reyes Acaquilpan	≈ 10 µg/m³	Moderate
Fuentes del Valle	≈ 13 µg/m³	Moderate
Santa María Chimalhuacán	≈ 12 µg/m³	Moderate
San Mateo Atenco	≈ 7 µg/m³	Good
Tultepec	≈ 13 µg/m³	Moderate
San Salvador Tizatlalli	≈ 7 µg/m³	Good
Zinacantepec	≈ 7 µg/m³	Good
Santiago Teyahualco	≈ 13 µg/m³	Moderate
Teoloyucan	≈ 13 µg/m³	Moderate
San Buenaventura	≈ 10 µg/m³	Moderate
Melchor Ocampo	≈ 13 µg/m³	Moderate
Tepotzotlán	≈ 13 µg/m³	Moderate
Santa Teresa	≈ 8 µg/m³	Good
San Jerónimo Cuatro Vientos	≈ 10 µg/m³	Moderate
Coyotepec	≈ 13 µg/m³	Moderate
San Martín Azcatepec	≈ 12 µg/m³	Moderate
San Pablo Autopan	≈ 7 µg/m³	Good
San Isidro	≈ 10 µg/m³	Moderate
Amecameca	≈ 10 µg/m³	Moderate
San José Guadalupe Otzacatipan	≈ 7 µg/m³	Good
Metepec	≈ 7 µg/m³	Good
Tultitlán de Mariano Escobedo	≈ 13 µg/m³	Moderate

Bad-air episodes in México

• Southern Mexico, January 20261 January 2026, 1 day20 cities182 µg/m³peak, Tlaquepaque
• Guanajuato, México and Mexico City, Mexico, December 202425 December 2024, 1 day9 cities78 µg/m³peak, Ciudad Nezahualcoyotl
• Southern Mexico, December 202325 December 2023, 1 day13 cities143 µg/m³peak, San Francisco Tlalcilalcalpan
• Southern Mexico, January 202319 to 21 January 2023, 3 days10 cities61 µg/m³peak, Guadalajara

Times when many cities around here had PM2.5 at twice their usual or more on the same days.

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SmogRank, most polluted cities in México, Mexico, PM2.5, this year to 6 Oct 2026, 21:00 UTC, smogrank.com/mx/region/mexico?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 2026-10-06 21:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.