SmogRank / World / Mexico / September 2024

Most polluted cities in Mexico, September 2024

2 cities in Mexico ranked by their average PM2.5 over the 30 days. Worst: Nogales at 11.4 µg/m³, #279 of 1,964 cities in the world. Cleanest: Heroica Matamoros at 5.9. A city needs measurements on 70% of the days to be ranked.

Mexico has 42 cities ranked over the last 30 days, but only 2 here: most of its monitors have no readings for September 2024 in OpenAQ's archive, where ours come from, or too few to rank. Cities missing from this board weren't clean, just not measured.

  1. 1NogalesSonora
    55
  2. 2Heroica MatamorosTamaulipas
    33
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

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

All cities in the world, September 2024 · Mexico now

Regions

Sonora 1Tamaulipas 1

Ranked cities in each region, September 2024.

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SmogRank, most polluted cities in Mexico, PM2.5, September 2024, smogrank.com/mx/history/2024-09 (accessed 7 Oct 2026).

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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.