Worst air pollution San Luis Río Colorado, today and tomorrow
Today (20 September): Air quality in San Luis Río Colorado is poor. AQI and PM10 are poor; PM2.5 is moderate; NO2, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 10:00 AM (PM10: 64.5/100).
Tomorrow (21 September 2026): Air quality in San Luis Río Colorado is moderate. AQI improves to moderate; PM2.5 decreases to fair; PM10 decreases to moderate; all other pollutants stay as today. Pollution peaks around 12:00 AM (PM10: 42.3/100). Airmine updates local air quality forecasts four times daily.
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San Luis Río Colorado's air quality reflects the flat Sonora-Arizona Colorado River delta desert border position adjacent to Yuma Arizona, with vehicle traffic on surrounding roads and the agricultural, maquiladora, and border crossing corridor contributing local sources. Windblown Sonoran and Yuma Desert dust contributes elevated PM10, while the flat desert terrain allows reasonable dispersal on most days and San Luis generally maintains moderate to good northwestern Mexican Sonoran Desert border city readings throughout most of the year.
Today - 20 September | Pollution peaks at 10:00
AQI:
Poor
64.5/100
PM2.5 (fine particles):
Moderate
45.8/100
PM10 (coarse particles):
Poor
64.5/100
NO2 (nitrogen dioxide):
Good
7.0/100
O3 (ozone):
Good
11.9/100
SO2 (sulfur dioxide):
Good
0.1/100
CO (carbon monoxide):
Good
0.4/100
HCHO (formaldehyde):
Good
0.8/100
PM1 (ultrafine particles):
Good
11.2/100
Levels show the poorest local air quality during the day
Tomorrow - 21 September | Pollution peaks at 00:00
AQI:
Moderate
42.3/100
PM2.5 (fine particles):
Fair
33.3/100
PM10 (coarse particles):
Moderate
42.3/100
NO2 (nitrogen dioxide):
Good
10.4/100
O3 (ozone):
Good
12.2/100
SO2 (sulfur dioxide):
Good
0.2/100
CO (carbon monoxide):
Good
0.4/100
HCHO (formaldehyde):
Good
1.1/100
PM1 (ultrafine particles):
Good
7.5/100
Pollen forecast in San Luis Río Colorado
View pollen forecastFrequently Asked Questions
Is air quality bad in San Luis Río Colorado right now?
On 20 September 2026, overall air quality in San Luis Río Colorado is poor. AQI is the main air quality indicator at 64.5/100. Pollution peaks around 10:00 AM (PM10: 64.5/100).
Will air quality be worse tomorrow in San Luis Río Colorado?
On 21 September 2026, air quality conditions in San Luis Río Colorado will be better than today, with AQI forecast at moderate at 42.3/100. Pollution peaks around 12:00 AM (PM10: 42.3/100).
When is air pollution at its worst in San Luis Río Colorado?
Air quality in San Luis Río Colorado tends to be worse when traffic on the surrounding roads together with crop farming build up and dry, windy weather picks up. Dust carried on these winds adds substantially to particulate levels. This is most noticeable during spring and autumn wind events.
Are air quality levels in San Luis Río Colorado 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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