SmogRank / World / Mexico / Sonora / May 2026

Most polluted cities in Sonora, Mexico, May 2026

1 city in Sonora, Mexico ranked by their average PM2.5 over the 31 days. The only one: Nogales at 9.5 µg/m³, #868 of 2,852 cities in the world. A city needs measurements on 70% of the days to be ranked.

  1. 1Nogales
    52
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, May 2026 · All cities in Mexico, May 2026 · Sonora now

Use this board

SmogRank, most polluted cities in Sonora, Mexico, PM2.5, May 2026, smogrank.com/mx/region/sonora/history/2026-05 (accessed 6 Oct 2026).

Download top 10 (PNG)

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.