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, #574 in the world.

The UK's Daily Air Quality Index (1 to 10), PM2.5 bands. 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	Band
Ensenada	≈ 10 µg/m³	Low
Rosarito	≈ 10 µg/m³	Low
Tecate	≈ 14 µg/m³	Low
Pórticos de San Antonio	≈ 10 µg/m³	Low
Santa Isabel	≈ 7 µg/m³	Low
La Joya	≈ 10 µg/m³	Low
Rodolfo Sánchez Taboada	≈ 8 µg/m³	Low
Terrazas del Valle	≈ 13 µg/m³	Low
Villa del Prado 2da Sección	≈ 13 µg/m³	Low
Ciudad Guadalupe Victoria	≈ 5 µg/m³	Low
San Felipe	≈ 4 µg/m³	Low
Lázaro Cárdenas	≈ 7 µg/m³	Low
Las Delicias	≈ 13 µg/m³	Low
Puebla	≈ 5 µg/m³	Low

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SmogRank, most polluted cities in Baja California, Mexico, PM2.5, this year to 2 Oct 2026, 07:00 UTC, smogrank.com/mx/region/baja-california?w=year.

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Updated 2026-10-02 07:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the UK DAQI PM2.5 sub-index.