Worst air pollution Mexicali, today and tomorrow
Today (20 September): Air quality in Mexicali is moderate. AQI, PM2.5, and PM10 are moderate; NO2, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 9:00 AM (PM10: 55.9/100).
Tomorrow (21 September 2026): Air quality in Mexicali is moderate. PM2.5 decreases to fair; all other pollutants stay as today. Pollution peaks around 1:00 AM (PM10: 41.9/100). 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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Mexicali's air quality reflects the flat Baja California-Sonora Desert border position at 9 metres below sea level, with vehicle traffic on surrounding roads and the maquiladora manufacturing, agricultural, and international border crossing corridor generating elevated PM2.5. Windblown Colorado Desert dust contributes elevated PM10, while the extreme summer heat intensifies ozone formation and the flat desert basin's limited topographic dispersal under calm conditions maintains moderate to elevated border industrial corridor readings throughout the year.
Today - 20 September | Pollution peaks at 09:00
AQI:
Moderate
55.9/100
PM2.5 (fine particles):
Moderate
43.8/100
PM10 (coarse particles):
Moderate
55.9/100
NO2 (nitrogen dioxide):
Good
9.4/100
O3 (ozone):
Good
7.4/100
SO2 (sulfur dioxide):
Good
0.2/100
CO (carbon monoxide):
Good
0.4/100
HCHO (formaldehyde):
Good
0.9/100
PM1 (ultrafine particles):
Good
10.6/100
Levels show the poorest local air quality during the day
Tomorrow - 21 September | Pollution peaks at 01:00
AQI:
Moderate
41.9/100
PM2.5 (fine particles):
Fair
36.0/100
PM10 (coarse particles):
Moderate
41.9/100
NO2 (nitrogen dioxide):
Good
12.2/100
O3 (ozone):
Good
8.3/100
SO2 (sulfur dioxide):
Good
0.4/100
CO (carbon monoxide):
Good
0.5/100
HCHO (formaldehyde):
Good
1.2/100
PM1 (ultrafine particles):
Good
10.0/100
Pollen forecast in Mexicali
View pollen forecastFrequently Asked Questions
Is air quality bad in Mexicali right now?
On 20 September 2026, overall air quality in Mexicali is moderate. AQI is the main air quality indicator at 55.9/100. Pollution peaks around 9:00 AM (PM10: 55.9/100).
Will air quality be worse tomorrow in Mexicali?
On 21 September 2026, air quality conditions in Mexicali will be similar to today, with AQI forecast at moderate at 41.9/100. Pollution peaks around 1:00 AM (PM10: 41.9/100).
When is air pollution at its worst in Mexicali?
In Mexicali, traffic on the surrounding roads, manufacturing activity, along with crop farming are the main local sources, with conditions worsening when dry, windy weather picks up. Dust carried on these winds adds substantially to particulate levels. Photochemical reactions in the heat push ozone levels higher.
Are air quality levels in Mexicali 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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