SmogRank / World / Mexico / San Luis Potosí / February 2026

Most unhealthy days in San Luis Potosí, Mexico, February 2026

1 city in San Luis Potosí, Mexico ranked by its share of unhealthy days over the 28 days. The most unhealthy days: San Luis Potosí, Mexico, 4 of 28 measured days. A city needs measurements on 70% of the days to be ranked.

Ranked by unhealthy days: the share of each city's measured days with a daily mean over 35.4 µg/m³ (US AQI 101+), Unhealthy for Sensitive Groups or worse on the US EPA's scale. Ties go to the higher average.

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 San Luis Potosí, Mexico, by unhealthy days, PM2.5, February 2026, smogrank.com/mx/region/san-luis-potosi/history/2026-02?by=days (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.