What is the air quality in San Cristóbal de Las Casas?

San Cristóbal de Las Casas, Mexico has an annual US AQI of 62 (Polluted) and average PM2.5 of 15.5 µg/m³, ranking #2449 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in San Cristóbal de Las Casas?

September is typically the cleanest month (AQI 53) and April the most polluted (AQI 91).

Where does San Cristóbal de Las Casas's air quality data come from?

PM2.5: 1998–2024 (satellite). From satellite data, because no government monitor covers the city. Full sources are on the methodology page.

San Cristóbal de Las Casas, Mexico — Air Quality & Clean City Guide 2026

San Cristóbal de Las Casas Air Quality Data

Global rank	City	Continent	AQI	PM2.5
2449	San Cristóbal de Las Casas, Mexico	North America	AQI 62	PM2.5 15.5 µg/m³