Worst air pollution São Francisco, today and tomorrow
Today (20 September): Air quality in São Francisco is moderate. AQI and PM2.5 are moderate; PM10 is fair; NO2, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 9:00 AM (PM2.5: 44.4/100).
Tomorrow (21 September 2026): Air quality in São Francisco is moderate. All pollutants stay as today. Pollution peaks around 12:00 AM (PM2.5: 42.8/100). 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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São Francisco's air quality in Minas Gerais reflects the São Francisco River middle valley at 499 metres in the northern Minas semi-arid region, with vehicle emissions from the MG-202 and surrounding cattle ranching and irrigated farming contributing local sources. The São Francisco valley's winds provide reasonable ventilation, while drought conditions and Caatinga burning contribute seasonal PM10 elevation across the semi-arid northern Minas Gerais region throughout the dry season.
Today - 20 September | Pollution peaks at 09:00
AQI:
Moderate
44.4/100
PM2.5 (fine particles):
Moderate
44.4/100
PM10 (coarse particles):
Fair
35.2/100
NO2 (nitrogen dioxide):
Good
0.1/100
O3 (ozone):
Good
15.7/100
SO2 (sulfur dioxide):
Good
0.3/100
CO (carbon monoxide):
Good
0.3/100
HCHO (formaldehyde):
Good
0.6/100
PM1 (ultrafine particles):
Good
17.5/100
Levels show the poorest local air quality during the day
Tomorrow - 21 September | Pollution peaks at 00:00
AQI:
Moderate
42.8/100
PM2.5 (fine particles):
Moderate
42.8/100
PM10 (coarse particles):
Fair
30.0/100
NO2 (nitrogen dioxide):
Good
0.1/100
O3 (ozone):
Good
13.7/100
SO2 (sulfur dioxide):
Good
0.4/100
CO (carbon monoxide):
Good
0.3/100
HCHO (formaldehyde):
Good
0.6/100
PM1 (ultrafine particles):
Good
15.6/100
Pollen forecast in São Francisco
View pollen forecastFrequently Asked Questions
Is air quality bad in São Francisco right now?
On 20 September 2026, overall air quality in São Francisco is moderate. AQI is the main air quality indicator at 44.4/100. Pollution peaks around 9:00 AM (PM2.5: 44.4/100).
Will air quality be worse tomorrow in São Francisco?
On 21 September 2026, air quality conditions in São Francisco will be similar to today, with AQI forecast at moderate at 42.8/100. Pollution peaks around 12:00 AM (PM2.5: 42.8/100).
When is air pollution at its worst in São Francisco?
Residents in São Francisco are most likely to notice reduced air quality when native caatinga scrub and cerrado trees pollen peaks, or due to vehicle emissions from the MG-202 and surrounding cattle ranching and irrigated farming; wind and rain both help clear the air fairly quickly here.
Are air quality levels in São Francisco 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: 20 September 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.
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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