SmogRank / World / Mexico / Querétaro / October 2026
Most polluted cities in Querétaro, Mexico, October 2026
2 cities in Querétaro, Mexico ranked by their average PM2.5 so far (5 of 31 days). Worst: San Juan del Río at 6.4 µg/m³, #1,345 of 2,246 cities in the world. Cleanest: Santiago de Querétaro at 5.5. A city needs measurements on 70% of the days to be ranked.
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 Querétaro, Mexico, PM2.5, October 2026 (so far), smogrank.com/mx/region/queretaro/history/2026-10 (accessed 7 Oct 2026).
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.