Worst air pollution Grajaú, today and tomorrow
Today (13 August): Air quality in Grajaú is fair. PM10 and O3 are fair; AQI, PM2.5, and PM1 are medium; NO2, SO2, CO, and HCHO are good. Pollution peaks around 12:00 PM (PM2.5: 54.3/100).
Tomorrow (14 August 2026): Air quality in Grajaú is poor. AQI worsens to poor; PM2.5 increases to poor; PM10 decreases to medium; all other pollutants stay as today. Pollution peaks around 3:00 PM (PM2.5: 62.2/100). 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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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 - 13 August | Pollution peaks at 12:00
AQI:
Medium
54.3/100
PM2.5 (fine particles):
Medium
54.3/100
PM10 (coarse particles):
Fair
35.8/100
NO2 (nitrogen dioxide):
Good
0.6/100
O3 (ozone):
Fair
21.3/100
SO2 (sulfur dioxide):
Good
13.7/100
CO (carbon monoxide):
Good
0.1/100
HCHO (formaldehyde):
Good
0.5/100
PM1 (ultrafine particles):
Medium
47.6/100
Levels show the poorest local air quality during the day
Tomorrow - 14 August | Pollution peaks at 15:00
AQI:
Poor
62.2/100
PM2.5 (fine particles):
Poor
62.2/100
PM10 (coarse particles):
Medium
42.6/100
NO2 (nitrogen dioxide):
Good
0.8/100
O3 (ozone):
Fair
24.3/100
SO2 (sulfur dioxide):
Good
14.5/100
CO (carbon monoxide):
Good
0.1/100
HCHO (formaldehyde):
Good
0.6/100
PM1 (ultrafine particles):
Medium
50.6/100
Pollen forecast in Grajaú
View pollen forecastFrequently Asked Questions
Is air quality bad in Grajaú right now?
On 13 August 2026, overall air quality in Grajaú is fair. PM10 is the main pollutant at 35.8/100. Pollution peaks around 12:00 PM (PM2.5: 54.3/100).
Will air quality be worse tomorrow in Grajaú?
On 14 August 2026, air quality conditions in Grajaú will be worse than today, with AQI forecast at poor at 62.2/100. Pollution peaks around 3:00 PM (PM2.5: 62.2/100).
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.
Why doesn’t the forecast always reflect wildfire impacts?
Airmine’s forecast uses CAMS (Copernicus Atmosphere Monitoring Service) as its background atmospheric model. While CAMS includes wildfire emissions, these are derived from satellite observations and are not available in real time. During rapidly evolving wildfire events, there may therefore be a delay before increased emissions are incorporated into the model. As a result, the forecast may temporarily underestimate PM₂.₅ and other pollutants associated with wildfire smoke.
During rapidly evolving wildfire events, CAMS may lag by approximately 1–2 days before increased wildfire emissions are fully represented, which can lead to temporary underestimation of PM₂.₅ concentrations in Airmine’s forecast.
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Data provided by Airmine — Last update: 13 August 2026 at 14:33 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.
Disclaimer: Forecasts are provided for informational purposes only and should not be relied upon as medical advice. Actual pollen and air quality conditions may vary from the forecast. If you have allergies, asthma, or another medical condition, consult a healthcare professional. Please see our Terms of Service for important information about limitations of liability.
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