SmogRank / World / Mexico / Sonora / October 2026

Most polluted cities in Sonora, Mexico, October 2026

1 city in Sonora, Mexico ranked by their average PM2.5 so far (5 of 31 days). The only one: Nogales at 6.2 µg/m³, #1,404 of 2,246 cities in the world. A city needs measurements on 70% of the days to be ranked.

  1. 1Nogales
    34
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, October 2026 (so far), smogrank.com/mx/region/sonora/history/2026-10 (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.