Worst air pollution Grajaú, today and tomorrow
Today (16 July): Air quality in Grajaú is fair. PM10, O3, and PM1 are fair; AQI and PM2.5 are medium; NO2, SO2, CO, and HCHO are good. Pollution peaks around 7:00 PM (PM2.5: 48.7/100).
Tomorrow (17 July 2026): Air quality in Grajaú is poor. AQI worsens to poor; PM2.5 increases to poor; PM10 decreases to medium; PM1 decreases to medium; all other pollutants stay as today. Pollution peaks around 1:00 PM (PM2.5: 61.3/100). Airmine updates local air quality forecasts four times daily.
For long term forecasts and maps, see the Airmine app
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
Use our Strava plugin to check your own exposure.
Grajaú's air quality reflects the Maranhão semi-arid interior at 286 metres in the Grajaú river basin, with vehicle emissions from the BR-010 and surrounding cattle, babaçu palm, and agricultural operations contributing local sources. Dry season burning from surrounding Maranhão Cerrado-Caatinga agricultural land contributes seasonal PM2.5 variation between June and September, while the flat Maranhão interior terrain generally allows reasonable dispersal on most days throughout the year.
Today - 16 July | Pollution peaks at 19:00
AQI:
Medium
48.7/100
PM2.5 (fine particles):
Medium
48.7/100
PM10 (coarse particles):
Fair
30.7/100
NO2 (nitrogen dioxide):
Good
0.5/100
O3 (ozone):
Fair
22.7/100
SO2 (sulfur dioxide):
Good
13.3/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
0.6/100
PM1 (ultrafine particles):
Fair
36.7/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 13:00
AQI:
Poor
61.3/100
PM2.5 (fine particles):
Poor
61.3/100
PM10 (coarse particles):
Medium
42.7/100
NO2 (nitrogen dioxide):
Good
0.6/100
O3 (ozone):
Fair
24.1/100
SO2 (sulfur dioxide):
Good
13.8/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
0.6/100
PM1 (ultrafine particles):
Medium
47.2/100
Pollen forecast in Grajaú
View pollen forecastFrequently Asked Questions
Is air quality bad in Grajaú right now?
On 16 July 2026, overall air quality in Grajaú is fair. PM1 is the main pollutant at 36.7/100. Pollution peaks around 7:00 PM (PM2.5: 48.7/100).
Will air quality be worse tomorrow in Grajaú?
On 17 July 2026, air quality conditions in Grajaú will be worse than today, with AQI forecast at poor at 61.3/100. Pollution peaks around 1:00 PM (PM2.5: 61.3/100).
When is air pollution at its worst in Grajaú?
People in Grajaú tend to notice reduced air quality when babaçu palm and caatinga scrub pollen peaks, or because of vehicle emissions from the BR-010 and surrounding cattle, babaçu palm, and agricultural operations; the picture usually improves again once the season turns.
Are air quality levels in Grajaú 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?
Check air quality in other popular cities:
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