Worst air pollution São Luís, today and tomorrow
Today (16 July): Air quality in São Luís is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 12:00 AM (O3: 25.2/100).
Tomorrow (17 July 2026): Air quality in São Luís is fair. All pollutants stay as today. Pollution peaks around 11:00 PM (O3: 22.1/100). Airmine updates local air quality forecasts four times daily.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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São Luís' air quality benefits from consistent Atlantic trade winds off the Maranhão coast that provide reliable ventilation across this island capital city throughout most of the year. Vehicle emissions from the growing metropolitan area and dry season burning from surrounding agricultural activity are the primary concerns, with coastal positioning generally keeping readings more favourable than inland Brazilian cities.
Today - 16 July | Pollution peaks at 00:00
AQI:
Fair
25.2/100
PM2.5 (fine particles):
Good
10.1/100
PM10 (coarse particles):
Good
4.2/100
NO2 (nitrogen dioxide):
Good
0/100
O3 (ozone):
Fair
25.2/100
SO2 (sulfur dioxide):
Good
0/100
CO (carbon monoxide):
Good
0/100
HCHO (formaldehyde):
Good
0.7/100
PM1 (ultrafine particles):
Good
4.1/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 23:00
AQI:
Fair
22.1/100
PM2.5 (fine particles):
Good
11.9/100
PM10 (coarse particles):
Good
4.6/100
NO2 (nitrogen dioxide):
Good
0/100
O3 (ozone):
Fair
22.1/100
SO2 (sulfur dioxide):
Good
0/100
CO (carbon monoxide):
Good
0/100
HCHO (formaldehyde):
Good
0.7/100
PM1 (ultrafine particles):
Good
7.6/100
Pollen forecast in São Luís
View pollen forecastFrequently Asked Questions
Is air quality bad in São Luís right now?
On 16 July 2026, overall air quality in São Luís is fair. AQI is the main air quality indicator at 25.2/100. Pollution peaks around 12:00 AM (O3: 25.2/100).
Will air quality be worse tomorrow in São Luís?
On 17 July 2026, air quality conditions in São Luís will be similar to today, with AQI forecast at fair at 22.1/100. Pollution peaks around 11:00 PM (O3: 22.1/100).
When is air pollution at its worst in São Luís?
The most noticeable dips in São Luís's air quality come when mango and native Atlantic Forest species pollen peaks, or because of vehicle emissions from the growing metropolitan area and dry season burning from surrounding agricultural activity; beyond that, the area's natural ventilation keeps air quality consistently favourable through the rest of the year.
Are air quality levels in São Luís based on measurements or forecasts?
It is forecasts derived by downscaling forecasts provided by EU’s Copernicus Atmosphere Monitoring Service (CAMS) by taking into account local conditions such as traffic patterns. CAMS bases its forecast on satellite measurements of particles and chemical compounds in the atmosphere. Airmine’s services were developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team.
Want to see air quality forecasts for other cities in Brazil?
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Data provided by Airmine — Last update: 16 July 2026 at 10:33 CEST (Data is updated four times daily.)
This forecast is produced independently using Airmine's own atmospheric data and models.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
For long term forecasts and maps, see the Airmine app