Worst air pollution San Francisco del Rincón, today and tomorrow
Today (20 September): Air quality in San Francisco del Rincón is very poor. AQI, PM2.5, and PM10 are very poor; PM1 is moderate; NO2, O3, SO2, CO, and HCHO are good. Pollution peaks around 2:00 PM (PM2.5: 100/100).
Tomorrow (21 September 2026): Air quality in San Francisco del Rincón is very poor. PM2.5 decreases to poor; PM1 decreases to fair; all other pollutants stay as today. Pollution peaks around 12:00 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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San Francisco del Rincón's air quality reflects the flat Guanajuato Bajío plateau at 1,724 metres, with vehicle traffic on surrounding roads and the jean and clothing manufacturing — San Francisco del Rincón being Mexico's denim capital — and agricultural corridor contributing distinctive textile dye VOC emissions alongside primary vehicle sources. The elevated plateau position aids dispersal on most days, while the denim manufacturing's distinctive chemical dye emissions represent San Francisco del Rincón's most locally unique air quality contribution throughout most of the year.
Today - 20 September | Pollution peaks at 14:00
AQI:
Very poor
100/100
PM2.5 (fine particles):
Very poor
100/100
PM10 (coarse particles):
Very poor
100/100
NO2 (nitrogen dioxide):
Good
0.6/100
O3 (ozone):
Good
14.3/100
SO2 (sulfur dioxide):
Good
0.4/100
CO (carbon monoxide):
Good
0.4/100
HCHO (formaldehyde):
Good
0.9/100
PM1 (ultrafine particles):
Moderate
43.1/100
Levels show the poorest local air quality during the day
Tomorrow - 21 September | Pollution peaks at 00:00
AQI:
Very poor
100/100
PM2.5 (fine particles):
Poor
79.0/100
PM10 (coarse particles):
Very poor
100/100
NO2 (nitrogen dioxide):
Good
0.9/100
O3 (ozone):
Good
15.5/100
SO2 (sulfur dioxide):
Good
0.4/100
CO (carbon monoxide):
Good
0.4/100
HCHO (formaldehyde):
Good
1.0/100
PM1 (ultrafine particles):
Fair
33.8/100
Frequently Asked Questions
Is air quality bad in San Francisco del Rincón right now?
On 20 September 2026, overall air quality in San Francisco del Rincón is very poor. AQI is the main air quality indicator at 100/100. Pollution peaks around 2:00 PM (PM2.5: 100/100).
Will air quality be worse tomorrow in San Francisco del Rincón?
On 21 September 2026, air quality conditions in San Francisco del Rincón will be similar to today, with AQI forecast at very poor at 100/100. Pollution peaks around 12:00 AM (PM10: 100/100).
When is air pollution at its worst in San Francisco del Rincón?
In San Francisco del Rincón, road traffic, steel, cement, and chemical production, together with textile and manufacturing operations are the main local sources, with conditions worsening when still air allows pollutants to build up. 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 San Francisco del Rincón 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: 21 September 2026 at 03:04 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.
Some text on this page may be generated or summarised using artificial intelligence (AI). Wherever possible, AI-generated content is enriched with Airmine's proprietary data to improve its accuracy and relevance. However, AI-generated content may still contain errors, omissions, or inaccuracies.
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