What is the air quality in São Luís?

São Luís, Brazil has an annual US AQI of 48 (Reasonable) and average PM2.5 of 9.8 µg/m³, ranking #641 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in São Luís?

June is typically the cleanest month (AQI 40) and February the most polluted (AQI 57).

Where does São Luís's air quality data come from?

PM2.5: 1998–2025 (monitors 2022–2025, satellite 1998–2022, 2024). Measured by government monitoring stations. Full sources are on the methodology page.

São Luís, Brazil — Air Quality & Clean City Guide 2026

São Luís Air Quality Data

Global rank	City	Continent	AQI	PM2.5
641	São Luís, Brazil	South America	AQI 48	PM2.5 9.8 µg/m³