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.
About 66.4K people in this city breathed unhealthy air on an average day so far this year.
Ranked by people: each city's population times its share of unhealthy days, those with a daily mean over 35.4 µg/m³ (US AQI 101+). That is how many people living there breathed unhealthy air on an average day. Only cities measured at 2 or more places at least 3 km apart are ranked: one monitor shouldn't speak for a whole city. Population is the city itself, not its wider metro area.
Cities coloured by their PM2.5 over the last 24 hours. Fires, smoke and ash: Oct 5, the newest UTC day mapped.
- 1Ciudad Nezahualcoyotl 66.4K
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 |
|---|---|
| Tlalnepantla | ≈ 13 µg/m³ |
| Cuautitlán Izcalli | ≈ 13 µg/m³ |
| Toluca | ≈ 7 µg/m³ |
| Ciudad López Mateos | ≈ 13 µg/m³ |
| Ojo de Agua | ≈ 13 µg/m³ |
| Xico | ≈ 10 µg/m³ |
| Ixtapaluca | ≈ 10 µg/m³ |
| Nicolás Romero | ≈ 13 µg/m³ |
| Zumpango | ≈ 13 µg/m³ |
| Coacalco | ≈ 13 µg/m³ |
| Buenavista | ≈ 13 µg/m³ |
| Cuautitlán | ≈ 13 µg/m³ |
| Chicoloapan | ≈ 12 µg/m³ |
| Chalco | ≈ 10 µg/m³ |
| San Pablo de las Salinas | ≈ 13 µg/m³ |
| Huixquilucan | ≈ 11 µg/m³ |
| Texcoco de Mora | ≈ 12 µg/m³ |
| Tepexpan | ≈ 12 µg/m³ |
| Los Reyes Acaquilpan | ≈ 10 µg/m³ |
| Fuentes del Valle | ≈ 13 µg/m³ |
| Santa María Chimalhuacán | ≈ 12 µg/m³ |
| San Mateo Atenco | ≈ 7 µg/m³ |
| Tultepec | ≈ 13 µg/m³ |
| San Salvador Tizatlalli | ≈ 7 µg/m³ |
| Zinacantepec | ≈ 7 µg/m³ |
| Santiago Teyahualco | ≈ 13 µg/m³ |
| Teoloyucan | ≈ 13 µg/m³ |
| San Buenaventura | ≈ 10 µg/m³ |
| Melchor Ocampo | ≈ 13 µg/m³ |
| Tepotzotlán | ≈ 13 µg/m³ |
| Santa Teresa | ≈ 8 µg/m³ |
| San Jerónimo Cuatro Vientos | ≈ 10 µg/m³ |
| Coyotepec | ≈ 13 µg/m³ |
| San Martín Azcatepec | ≈ 12 µg/m³ |
| San Pablo Autopan | ≈ 7 µg/m³ |
| San Isidro | ≈ 10 µg/m³ |
| Amecameca | ≈ 10 µg/m³ |
| San José Guadalupe Otzacatipan | ≈ 7 µg/m³ |
| Metepec | ≈ 7 µg/m³ |
| Tultitlán de Mariano Escobedo | ≈ 13 µg/m³ |
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.
Use this board
SmogRank, most polluted cities in México, Mexico, PM2.5, this year to 6 Oct 2026, 23:00 UTC, smogrank.com/mx/region/mexico?w=year.
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 23:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.