Worst air pollution Hermosillo, today and tomorrow
Today (20 September): Air quality in Hermosillo is very poor. AQI and PM10 are very poor; PM2.5 is poor; NO2, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 4:00 PM (PM10: 100/100).
Tomorrow (21 September 2026): Air quality in Hermosillo is very poor. All pollutants stay as today. Pollution peaks around 2:00 PM (PM10: 100/100). 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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Hermosillo's air quality reflects the flat Sonoran Desert plain at 215 metres, with vehicle traffic on surrounding roads and the maquiladora manufacturing, mining, and agricultural corridor contributing local sources. Windblown Sonoran Desert dust contributes elevated PM10 during dry dust storm events, while the flat semi-arid terrain generally allows reasonable dispersal and Hermosillo generally maintains moderate to good northwestern Mexican desert city readings throughout most of the year.
Today - 20 September | Pollution peaks at 16:00
AQI:
Very poor
100/100
PM2.5 (fine particles):
Poor
67.1/100
PM10 (coarse particles):
Very poor
100/100
NO2 (nitrogen dioxide):
Good
13.8/100
O3 (ozone):
Good
10.0/100
SO2 (sulfur dioxide):
Good
0.2/100
CO (carbon monoxide):
Good
0.4/100
HCHO (formaldehyde):
Good
1.5/100
PM1 (ultrafine particles):
Good
8.5/100
Levels show the poorest local air quality during the day
Tomorrow - 21 September | Pollution peaks at 14:00
AQI:
Very poor
100/100
PM2.5 (fine particles):
Poor
65.5/100
PM10 (coarse particles):
Very poor
100/100
NO2 (nitrogen dioxide):
Good
7.3/100
O3 (ozone):
Good
11.9/100
SO2 (sulfur dioxide):
Good
0.3/100
CO (carbon monoxide):
Good
0.4/100
HCHO (formaldehyde):
Good
1.1/100
PM1 (ultrafine particles):
Good
9.3/100
Frequently Asked Questions
Is air quality bad in Hermosillo right now?
On 20 September 2026, overall air quality in Hermosillo is very poor. AQI is the main air quality indicator at 100/100. Pollution peaks around 4:00 PM (PM10: 100/100).
Will air quality be worse tomorrow in Hermosillo?
On 21 September 2026, air quality conditions in Hermosillo will be similar to today, with AQI forecast at very poor at 100/100. Pollution peaks around 2:00 PM (PM10: 100/100).
When is air pollution at its worst in Hermosillo?
The biggest local contributors to pollution in Hermosillo are traffic on the surrounding roads, quarrying activity, together with light manufacturing, particularly once dry, windy weather picks up. Dust carried on these winds adds substantially to particulate levels. These episodes tend to cluster in spring and autumn.
Are air quality levels in Hermosillo 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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