Worst air pollution Mexico City, today and tomorrow
Today (21 July): Air quality in Mexico City is fair. PM2.5 and O3 are fair; AQI and PM10 are medium; NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 7:00 PM (PM10: 40.0/100).
Tomorrow (22 July 2026): Air quality in Mexico City is fair. All pollutants stay as today. Pollution peaks around 7:00 AM (PM10: 44.4/100). Airmine updates local air quality forecasts four times daily.
For long term forecasts and maps, see the Airmine app
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Mexico City's air quality reflects the Valley of Mexico's severe topographic trap at 2,240 metres, with the surrounding Sierra Nevada and Sierra de las Cruces ranges creating near-complete basin enclosure that concentrates vehicle emissions from the Periferico and the extraordinary metropolitan vehicle density under persistent temperature inversions. The thermal inversion problem and the basin's poor dispersal maintain Mexico City among the Americas' most persistently challenging major urban air quality environments, while the elevated altitude paradoxically worsens ozone formation throughout the year.
Today - 21 July | Pollution peaks at 19:00
AQI:
Medium
40.0/100
PM2.5 (fine particles):
Fair
32.0/100
PM10 (coarse particles):
Medium
40.0/100
NO2 (nitrogen dioxide):
Good
0.1/100
O3 (ozone):
Fair
25.2/100
SO2 (sulfur dioxide):
Good
0.1/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
1.0/100
PM1 (ultrafine particles):
Good
4.2/100
Levels show the poorest local air quality during the day
Tomorrow - 22 July | Pollution peaks at 07:00
AQI:
Medium
44.4/100
PM2.5 (fine particles):
Fair
32.1/100
PM10 (coarse particles):
Medium
44.4/100
NO2 (nitrogen dioxide):
Good
0.1/100
O3 (ozone):
Fair
34.5/100
SO2 (sulfur dioxide):
Good
0.1/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
0.7/100
PM1 (ultrafine particles):
Good
4.4/100
Frequently Asked Questions
Is air quality bad in Mexico City right now?
On 21 July 2026, overall air quality in Mexico City is fair. PM2.5 is the main pollutant at 32.0/100. Pollution peaks around 7:00 PM (PM10: 40.0/100).
Will air quality be worse tomorrow in Mexico City?
On 22 July 2026, air quality conditions in Mexico City will be similar to today, with O3 forecast at fair at 34.5/100. Pollution peaks around 7:00 AM (PM10: 44.4/100).
When is air pollution at its worst in Mexico City?
In Mexico City, vehicle traffic is the main local source, with conditions worsening when the surrounding valley traps air close to the ground. The surrounding valley terrain holds pollutants near the surface rather than letting them disperse. Heat and sunlight combine with emissions to form ozone at ground level.
Are air quality levels in Mexico City 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 July 2026 at 16:20 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