SmogRank / World / North America / Mexico / Baja California
Most polluted cities in Baja California, Mexico
2 measured cities, this year; 2 above the WHO annual guideline. Worst: Mexicali at 15.9 µg/m³, #575 in the world.
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
Baja California 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 |
|---|---|
| Ensenada | ≈ 10 µg/m³ |
| Rosarito | ≈ 10 µg/m³ |
| Tecate | ≈ 14 µg/m³ |
| Pórticos de San Antonio | ≈ 10 µg/m³ |
| Santa Isabel | ≈ 7 µg/m³ |
| La Joya | ≈ 10 µg/m³ |
| Rodolfo Sánchez Taboada | ≈ 8 µg/m³ |
| Terrazas del Valle | ≈ 13 µg/m³ |
| Villa del Prado 2da Sección | ≈ 13 µg/m³ |
| Ciudad Guadalupe Victoria | ≈ 5 µg/m³ |
| San Felipe | ≈ 4 µg/m³ |
| Lázaro Cárdenas | ≈ 7 µg/m³ |
| Las Delicias | ≈ 13 µg/m³ |
| Puebla | ≈ 5 µg/m³ |
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SmogRank, most polluted cities in Baja California, Mexico, PM2.5, this year to 2 Oct 2026, 05:00 UTC, smogrank.com/mx/region/baja-california?w=year.
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Updated 2026-10-02 05:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.