SmogRank / World / Mexico / Nuevo León / November 2025

Most polluted cities in Nuevo León, Mexico, November 2025

7 cities in Nuevo León, Mexico ranked by their average PM2.5 over the 30 days. Worst: Ciudad Benito Juárez at 27.2 µg/m³, #272 of 2,662 cities in the world. Cleanest: Monterrey at 17.8. A city needs measurements on 70% of the days to be ranked.

About 127K people in these 3 cities breathed unhealthy air on an average day of November 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.

← Ciudad General Escobedo 94.8K 90K0
Every city in Nuevo León, Mexico ranked for November 2025 with monitors in two or more places, one column each, ranked by people breathing unhealthy air: height is people on an average day, colour its average. Point at it to read a city; tap to open it.
  1. 1Ciudad General Escobedo
    94.8K
  2. 2Santa Catarina
    32.6K
  3. 3Monterrey
    0
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 Nuevo León, Mexico, PM2.5, November 2025, smogrank.com/mx/region/nuevo-leon/history/2025-11 (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.