SmogRank / World / Mexico / Sonora / 2025

Most polluted cities in Sonora, Mexico, 2025

1 city in Sonora, Mexico ranked by their average PM2.5 over the 365 days; 1 above the WHO annual guideline (5.0 µg/m³). The only one: Nogales at 13.2 µg/m³, #507 of 2,624 cities in the world. A city needs measurements on 70% of the days to be ranked.

  1. 1Nogales
    592.6×
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

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SmogRank, most polluted cities in Sonora, Mexico, PM2.5, 2025, smogrank.com/mx/region/sonora/history/2025 (accessed 6 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.