Worst air pollution San Ramón, today and tomorrow
Today (9 August): Air quality in San Ramón is good. AQI, PM2.5, PM10, NO2, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 9:00 AM (O3: 15.2/100).
Tomorrow (10 August 2026): Air quality in San Ramón is good. All pollutants stay as today. Pollution peaks around 10:00 AM (O3: 18.7/100). 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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San Ramón in Costa Rica reflects the Alajuela Province's Central Valley corridor at 1,015 metres, with vehicle traffic on surrounding roads and the coffee, agricultural, and university corridor contributing local sources. The Costa Rican volcanic highland's topographic variation provides natural ventilation corridors, while the tropical climate's frequent convective rain provides effective atmospheric cleansing and San Ramón generally maintains good to moderate Costa Rican central plateau readings throughout most of the year.
Today - 9 August | Pollution peaks at 09:00
AQI:
Good
15.2/100
PM2.5 (fine particles):
Good
2.3/100
PM10 (coarse particles):
Good
1.0/100
NO2 (nitrogen dioxide):
Good
0/100
O3 (ozone):
Good
15.2/100
SO2 (sulfur dioxide):
Good
0/100
CO (carbon monoxide):
Good
0/100
HCHO (formaldehyde):
Good
8.0/100
PM1 (ultrafine particles):
Good
2.8/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 10:00
AQI:
Good
18.7/100
PM2.5 (fine particles):
Good
2.4/100
PM10 (coarse particles):
Good
0.8/100
NO2 (nitrogen dioxide):
Good
0/100
O3 (ozone):
Good
18.7/100
SO2 (sulfur dioxide):
Good
0/100
CO (carbon monoxide):
Good
0/100
HCHO (formaldehyde):
Good
10.2/100
PM1 (ultrafine particles):
Good
3.0/100
Frequently Asked Questions
Is air quality bad in San Ramón right now?
On 9 August 2026, overall air quality in San Ramón is good. AQI is the main air quality indicator at 15.2/100. Pollution peaks around 9:00 AM (O3: 15.2/100).
Will air quality be worse tomorrow in San Ramón?
On 10 August 2026, air quality conditions in San Ramón will be similar to today, with AQI forecast at good at 18.7/100. Pollution peaks around 10:00 AM (O3: 18.7/100).
When is air pollution at its worst in San Ramón?
In San Ramón, vehicle traffic together with agricultural activity are the main local sources, with conditions worsening when weather conditions turn unfavourable. Background emissions and local weather both shape how conditions change from day to day. Background emissions and local weather both play a role in day-to-day changes.
Are air quality levels in San Ramón 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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