Worst air pollution San Juan del Río, today and tomorrow
Today (16 July): Air quality in San Juan del Río is fair. O3 is fair; AQI, PM2.5, and PM10 are medium; NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 12:00 AM (PM10: 44.8/100).
Tomorrow (17 July 2026): Air quality in San Juan del Río is fair. PM2.5 increases to fair; O3 decreases to good; all other pollutants stay as today. Pollution peaks around 6:00 AM (PM10: 42.1/100). 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 Juan del Río's air quality reflects the flat Querétaro plateau at 1,894 metres, with vehicle traffic on surrounding roads and the automotive, chemical, and manufacturing corridor contributing local sources. The elevated plateau position aids dispersal on most days, while winter inversions create modest seasonal challenges and San Juan del Río's manufacturing and automotive character generally maintains moderate central Mexican plateau industrial corridor readings throughout most of the year.
Today - 16 July | Pollution peaks at 00:00
AQI:
Medium
44.8/100
PM2.5 (fine particles):
Medium
43.3/100
PM10 (coarse particles):
Medium
44.8/100
NO2 (nitrogen dioxide):
Good
0.1/100
O3 (ozone):
Fair
20.9/100
SO2 (sulfur dioxide):
Good
0.1/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
1.6/100
PM1 (ultrafine particles):
Good
7.3/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 06:00
AQI:
Medium
42.1/100
PM2.5 (fine particles):
Fair
32.5/100
PM10 (coarse particles):
Medium
42.1/100
NO2 (nitrogen dioxide):
Good
0.0/100
O3 (ozone):
Good
19.1/100
SO2 (sulfur dioxide):
Good
0.1/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
1.8/100
PM1 (ultrafine particles):
Good
5.1/100
Frequently Asked Questions
Is air quality bad in San Juan del Río right now?
On 16 July 2026, overall air quality in San Juan del Río is fair. O3 is the main pollutant at 20.9/100. Pollution peaks around 12:00 AM (PM10: 44.8/100).
Will air quality be worse tomorrow in San Juan del Río?
On 17 July 2026, air quality conditions in San Juan del Río will be similar to today, with PM2.5 forecast at fair at 32.5/100. Pollution peaks around 6:00 AM (PM10: 42.1/100).
When is air pollution at its worst in San Juan del Río?
In San Juan del Río, road traffic, heavy industrial and chemical processing, and textile and manufacturing operations are the main local sources, with conditions worsening when dry, windy weather picks up. Strong seasonal winds can lift dust from the surrounding dry terrain and push particulate levels sharply higher. These episodes tend to cluster in spring and autumn.
Are air quality levels in San Juan del Río 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.
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Data provided by Airmine — Last update: 16 July 2026 at 10:33 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.
For long term forecasts and maps, see the Airmine app