São Luís: Air Pollution Today — AQI Index, PM2.5/PM10, Smog Alerts and Forecast

Pollution and air quality forecast for São Luís. Today is Thursday, August 27, 2026. The following air pollution values have been recorded for São Luís:

1. particulate matter (PM2.5) dust - 10 (Good)
2. particulate matter (PM10) suspended dust - 15 (Good)
3. ozone (O3) - 62 (Good)
4. nitrogen dioxide (NO2) - 2 (Good)
5. sulfur dioxide (SO2) - 1 (Good)
6. carbon monoxide (CO) - 110 (Good)

Real-time Air Quality Index (AQI) for São Luís, Wednesday, August 26, 2026: 1.

What is the current level of PM2.5 in São Luís? (particulate matter (PM2.5) dust)
Today's PM2.5 level is: 10 (Good) For comparison, the highest level of PM2.5 in São Luís in the last 7 days was: 13 (Wednesday, August 26, 2026) and the lowest: 8 (Thursday, August 20, 2026).

What is the level of PM10 today in São Luís? (particulate matter (PM10) suspended dust)
The current level of particulate matter PM10 in São Luís is: 15 (Good)

How is the O3 level today in São Luís? (ozone (O3))
62 (Good)

How high is the level of NO2? (nitrogen dioxide (NO2))
2 (Good)

What is the level of SO2 pollution? (sulfur dioxide (SO2))
1 (Good)

How high is the CO level? (carbon monoxide (CO))
110 (Good)

Current data Wednesday, August 26, 2026 at 10:00 PM

São Luís

Wednesday, August 26, 2026 at 10:00 PM

🌦️ Weather · 16-day Forecast — Brazil

16-day weather forecast for Brazil: today around 40°C (partly cloudy), lows near 22°C. Daily temperature and conditions, updated every day. A moderate breeze (about 9 km/h) is partially dispersing pollutants today.

☀️ UV Index · 16-day Forecast — Brazil

The UV index in Brazil today is 7.9 (high) — unprotected fair skin can burn in about 25 minutes.

📍 Air quality in nearby cities

Live PM2.5 around São Luís — compare nearby locations.

• São Paulo 62 µg/m³
• Rio de Janeiro 23 µg/m³
• Salvador 17 µg/m³
• Fortaleza 11 µg/m³
• Belo Horizonte 7 µg/m³
• Brasília 16 µg/m³
• Curitiba 18 µg/m³
• Manaus 16 µg/m³

Frequently asked questions

Is the air safe to breathe in São Luís today?

The current average PM2.5 across São Luís is about 10 µg/m³, rated “Good”. Air quality is good — outdoor activities are fine for everyone.

What is the current PM2.5 level in São Luís?

Right now PM2.5 in São Luís averages about 10 µg/m³ (“Good”). PM2.5 are fine particles small enough to reach the lungs and bloodstream.

Which day last week had the worst air in São Luís?

Over the past week, the highest daily PM2.5 in São Luís was recorded on Wednesday, August 26 (about 13 µg/m³).

What is the UV index in São Luís today?

The UV index in São Luís today is 7.9 (high) — unprotected fair skin can burn in about 25 minutes.

Does today's wind help disperse smog in São Luís?

A moderate breeze (about 9 km/h) is partially dispersing pollutants today.

How is air quality measured?

Air quality here is based on PM2.5 — the concentration of fine particulate matter in µg/m³. Lower values mean cleaner air. Data is updated daily from Open-Meteo.