Worst air pollution Santiago, today and tomorrow
Today (9 August): Air quality in Santiago is very poor. AQI and PM10 are very poor; PM2.5 is poor; PM1 is fair; NO2, O3, SO2, CO, and HCHO are good. Pollution peaks around 8:00 PM (PM10: 100/100).
Tomorrow (10 August 2026): Air quality in Santiago is very poor. PM1 decreases to good; all other pollutants stay as today. Pollution peaks around 12:00 AM (PM10: 92.1/100). 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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Santiago in Dominican Republic reflects the flat Cibao Valley's Yaque del Norte River position at 178 metres between the Cordillera Central and the Septentrional range, with vehicle traffic on surrounding roads and the vehicle density, manufacturing, and construction corridor generating elevated PM2.5. The valley's topographic enclosure creates concentration under inversions, while the Atlantic northeast trade winds provide seasonal ventilation and Santiago generally maintains moderate to elevated Dominican Republic industrial valley metropolitan readings throughout most of the year.
Today - 9 August | Pollution peaks at 20:00
AQI:
Very poor
100/100
PM2.5 (fine particles):
Poor
73.2/100
PM10 (coarse particles):
Very poor
100/100
NO2 (nitrogen dioxide):
Good
0.7/100
O3 (ozone):
Good
20.0/100
SO2 (sulfur dioxide):
Good
3.6/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.5/100
PM1 (ultrafine particles):
Fair
20.5/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 00:00
AQI:
Very poor
92.1/100
PM2.5 (fine particles):
Poor
66.6/100
PM10 (coarse particles):
Very poor
92.1/100
NO2 (nitrogen dioxide):
Good
0.7/100
O3 (ozone):
Good
18.5/100
SO2 (sulfur dioxide):
Good
2.5/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
1.9/100
PM1 (ultrafine particles):
Good
18.2/100
Frequently Asked Questions
Is air quality bad in Santiago right now?
On 9 August 2026, overall air quality in Santiago is very poor. AQI is the main air quality indicator at 100/100. Pollution peaks around 8:00 PM (PM10: 100/100).
Will air quality be worse tomorrow in Santiago?
On 10 August 2026, air quality conditions in Santiago will be similar to today, with AQI forecast at very poor at 92.1/100. Pollution peaks around 12:00 AM (PM10: 92.1/100).
When is air pollution at its worst in Santiago?
In Santiago, traffic on the surrounding roads, light manufacturing, as well as ongoing construction work are the main local sources, with conditions worsening when calm, stagnant conditions settle in the surrounding valley. The bowl-like terrain here limits how quickly pollutants can escape. Strong seasonal winds can lift dust from the surrounding dry terrain and push particulate levels sharply higher.
Are air quality levels in Santiago 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: 9 August 2026 at 20:27 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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