Worst air pollution San Cristóbal, today and tomorrow
Today (9 August): Air quality in San Cristóbal is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 8:00 AM (O3: 22.0/100).
Tomorrow (10 August 2026): Air quality in San Cristóbal is fair. All pollutants stay as today. Pollution peaks around 5:00 AM (O3: 22.0/100). 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 Cristóbal's air quality reflects the Chiapas Highland's Los Altos enclosed basin at 2,176 metres surrounded by the Altos de Chiapas ranges, with vehicle traffic on surrounding roads and the tourism, indigenous crafts, and government corridor contributing local sources. The basin's near-complete mountain enclosure creates severe concentration under winter inversions, while the elevated altitude worsens ozone formation and the wood-burning residential heating in this indigenous highland community generates elevated winter PM2.5 throughout the year.
Today - 9 August | Pollution peaks at 08:00
AQI:
Fair
22.0/100
PM2.5 (fine particles):
Good
12.6/100
PM10 (coarse particles):
Good
15.1/100
NO2 (nitrogen dioxide):
Good
3.7/100
O3 (ozone):
Fair
22.0/100
SO2 (sulfur dioxide):
Good
1.6/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.2/100
PM1 (ultrafine particles):
Good
5.9/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 05:00
AQI:
Fair
22.0/100
PM2.5 (fine particles):
Good
13.5/100
PM10 (coarse particles):
Good
16.0/100
NO2 (nitrogen dioxide):
Good
3.5/100
O3 (ozone):
Fair
22.0/100
SO2 (sulfur dioxide):
Good
1.4/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.6/100
PM1 (ultrafine particles):
Good
6.2/100
Frequently Asked Questions
Is air quality bad in San Cristóbal right now?
On 9 August 2026, overall air quality in San Cristóbal is fair. AQI is the main air quality indicator at 22.0/100. Pollution peaks around 8:00 AM (O3: 22.0/100).
Will air quality be worse tomorrow in San Cristóbal?
On 10 August 2026, air quality conditions in San Cristóbal will be similar to today, with AQI forecast at fair at 22.0/100. Pollution peaks around 5:00 AM (O3: 22.0/100).
When is air pollution at its worst in San Cristóbal?
In San Cristóbal, traffic on the surrounding roads, charcoal and wood-burning, together with seasonal tourism traffic are the main local sources, with conditions worsening when calm, stagnant conditions settle in the surrounding valley. Topographic enclosure in the valley lets pollution accumulate rather than clear out. Photochemical reactions in the heat push ozone levels higher.
Are air quality levels in San Cristóbal 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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