What is the air quality in León?

León, Mexico has an annual US AQI of 68 (Polluted) and average PM2.5 of 18.3 µg/m³, ranking #3052 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in León?

September is typically the cleanest month (AQI 59) and May the most polluted (AQI 81).

Where does León's air quality data come from?

PM2.5: 1998–2026 (monitors 2015, 2017, 2020–2026, satellite 1998–2019, 2023–2024; 2025–2026 provisional). Measured by government monitoring stations. Full sources are on the methodology page.

León, Mexico — Air Quality & Clean City Guide 2026

León Air Quality Data

Global rank	City	Continent	AQI	PM2.5
3052	León, Mexico	North America	AQI 68	PM2.5 18.3 µg/m³