Worst air pollution Rialto, today and tomorrow
Today (15 July): Air quality in Rialto is fair. AQI, PM10, and O3 are fair; PM2.5, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 8:00 AM (O3: 31.2/100).
Tomorrow (16 July 2026): Air quality in Rialto is fair. All pollutants stay as today. Pollution peaks around 9:00 AM (O3: 29.9/100). 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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Rialto's air quality reflects the Inland Empire basin's severe topographic enclosure, with vehicle emissions from I-210 and the surrounding logistics and warehouse district in San Bernardino County generating concentrated diesel PM2.5 from freight traffic. The San Gabriel Mountains to the north and the Jurupa Hills to the south create topographic concentration, while the persistent basin inversion traps the combined vehicle and freight emissions throughout much of the year.
Today - 15 July | Pollution peaks at 08:00
AQI:
Fair
31.2/100
PM2.5 (fine particles):
Good
18.0/100
PM10 (coarse particles):
Fair
26.9/100
NO2 (nitrogen dioxide):
Good
0.9/100
O3 (ozone):
Fair
31.2/100
SO2 (sulfur dioxide):
Good
1.7/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
0.9/100
PM1 (ultrafine particles):
Good
3.1/100
Levels show the poorest local air quality during the day
Tomorrow - 16 July | Pollution peaks at 09:00
AQI:
Fair
29.9/100
PM2.5 (fine particles):
Good
16.7/100
PM10 (coarse particles):
Fair
27.8/100
NO2 (nitrogen dioxide):
Good
1.9/100
O3 (ozone):
Fair
29.9/100
SO2 (sulfur dioxide):
Good
3.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
1.0/100
PM1 (ultrafine particles):
Good
3.3/100
Pollen forecast in Rialto
View pollen forecastFrequently Asked Questions
Is air quality bad in Rialto right now?
On 15 July 2026, overall air quality in Rialto is fair. AQI is the main air quality indicator at 31.2/100. Pollution peaks around 8:00 AM (O3: 31.2/100).
Will air quality be worse tomorrow in Rialto?
On 16 July 2026, air quality conditions in Rialto will be similar to today, with AQI forecast at fair at 29.9/100. Pollution peaks around 9:00 AM (O3: 29.9/100).
When is air pollution at its worst in Rialto?
Rialto's air quality follows a clear seasonal pattern: winter typically brings the cleanest stretch, once occasional rain clears the basin, but summer and early autumn bring the highest ozone levels, and wildfire smoke can spike particulate readings sharply from August through October. The mountains ringing the basin can trap pollution close to the ground for days when winds are calm.
Are air quality levels in Rialto 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