SmogRank / World / Mexico / Nuevo León / August 2025
Most polluted cities in Nuevo León, Mexico, August 2025
2 cities in Nuevo León, Mexico ranked by their average PM2.5 over the 31 days. Worst: Ciudad Benito Juárez at 14.8 µg/m³, #352 of 2,841 cities in the world. Cleanest: Monterrey at 14.3. A city needs measurements on 70% of the days to be ranked.
Nuevo León has 9 cities ranked over the last 30 days, but only 2 here: most of its monitors have no readings for August 2025 in OpenAQ's archive, where ours come from, or too few to rank. Cities missing from this board weren't clean, just not measured.
About 0 people in this city breathed unhealthy air on an average day of August 2025.
Ranked by people: each city's population times its share of unhealthy days, those with a daily mean over 35.4 µg/m³ (US AQI 101+). That is how many people living there breathed unhealthy air on an average day. Only cities measured at 2 or more places at least 3 km apart are ranked: one monitor shouldn't speak for a whole city. Population is the city itself, not its wider metro area.
- 1Monterrey 0
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 Nuevo León, Mexico, PM2.5, August 2025, smogrank.com/mx/region/nuevo-leon/history/2025-08 (accessed 6 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.