Worst air pollution Guanajuato, today and tomorrow
Today (9 August): Air quality in Guanajuato is poor. AQI and PM10 are poor; O3 is fair; PM2.5 is medium; NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 4:00 AM (PM10: 78.1/100).
Tomorrow (10 August 2026): Air quality in Guanajuato is very poor. AQI worsens to very poor; PM2.5 increases to poor; PM10 increases to very poor; all other pollutants stay as today. Pollution peaks around 4:00 AM (PM10: 100/100). 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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Guanajuato's air quality reflects the historic Bajío highland's deeply enclosed Guanajuato River canyon at 2,012 metres, with vehicle traffic on the surrounding winding narrow historic roads and the UNESCO heritage tourism, silver mining legacy, and university corridor contributing local sources. The canyon's near-complete topographic enclosure creates concentration under calm conditions, while the elevated position aids summer dispersal and the extraordinary colonial canyon city setting creates distinctive air quality dynamics throughout most of the year.
Today - 9 August | Pollution peaks at 04:00
AQI:
Poor
78.1/100
PM2.5 (fine particles):
Medium
49.3/100
PM10 (coarse particles):
Poor
78.1/100
NO2 (nitrogen dioxide):
Good
1.0/100
O3 (ozone):
Fair
20.0/100
SO2 (sulfur dioxide):
Good
7.7/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
0.9/100
PM1 (ultrafine particles):
Good
12.5/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 04:00
AQI:
Very poor
100/100
PM2.5 (fine particles):
Poor
60.7/100
PM10 (coarse particles):
Very poor
100/100
NO2 (nitrogen dioxide):
Good
0.8/100
O3 (ozone):
Fair
21.4/100
SO2 (sulfur dioxide):
Good
8.1/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
1.1/100
PM1 (ultrafine particles):
Good
15.8/100
Frequently Asked Questions
Is air quality bad in Guanajuato right now?
On 9 August 2026, overall air quality in Guanajuato is poor. AQI is the main air quality indicator at 78.1/100. Pollution peaks around 4:00 AM (PM10: 78.1/100).
Will air quality be worse tomorrow in Guanajuato?
On 10 August 2026, air quality conditions in Guanajuato will be worse than today, with AQI forecast at very poor at 100/100. Pollution peaks around 4:00 AM (PM10: 100/100).
When is air pollution at its worst in Guanajuato?
In Guanajuato, traffic on the surrounding roads, quarrying activity, as well as seasonal tourism traffic are the main local sources, with conditions worsening when winds are light and dispersion is poor. Local weather patterns add further variation on top of these sources. Local weather patterns add further day-to-day variation.
Are air quality levels in Guanajuato 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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