Worst air pollution San Jacinto, today and tomorrow
Today (15 July): Air quality in San Jacinto is fair. AQI, PM10, and O3 are fair; PM2.5, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 7:00 AM (O3: 30.4/100).
Tomorrow (16 July 2026): Air quality in San Jacinto is fair. PM10 decreases to good; all other pollutants stay as today. Pollution peaks around 9:00 AM (O3: 29.7/100). 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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San Jacinto's air quality reflects the San Jacinto Valley's severe topographic enclosure in Riverside County between the San Jacinto and Santa Rosa mountains, with vehicle emissions from SR-79 the primary local source. The valley's near-complete mountain enclosure creates persistent temperature inversion episodes that concentrate ozone and PM2.5, while windblown dust from the San Jacinto Valley's dry lake bed contributes PM10 and the broad valley basin consistently produces some of Riverside County's more challenging air quality conditions throughout the year.
Today - 15 July | Pollution peaks at 07:00
AQI:
Fair
30.4/100
PM2.5 (fine particles):
Good
13.2/100
PM10 (coarse particles):
Fair
21.3/100
NO2 (nitrogen dioxide):
Good
0/100
O3 (ozone):
Fair
30.4/100
SO2 (sulfur dioxide):
Good
0/100
CO (carbon monoxide):
Good
0/100
HCHO (formaldehyde):
Good
0.9/100
PM1 (ultrafine particles):
Good
2.4/100
Levels show the poorest local air quality during the day
Tomorrow - 16 July | Pollution peaks at 09:00
AQI:
Fair
29.7/100
PM2.5 (fine particles):
Good
10.7/100
PM10 (coarse particles):
Good
18.2/100
NO2 (nitrogen dioxide):
Good
0/100
O3 (ozone):
Fair
29.7/100
SO2 (sulfur dioxide):
Good
0/100
CO (carbon monoxide):
Good
0/100
HCHO (formaldehyde):
Good
0.9/100
PM1 (ultrafine particles):
Good
2.4/100
Pollen forecast in San Jacinto
View pollen forecastFrequently Asked Questions
Is air quality bad in San Jacinto right now?
On 15 July 2026, overall air quality in San Jacinto is fair. AQI is the main air quality indicator at 30.4/100. Pollution peaks around 7:00 AM (O3: 30.4/100).
Will air quality be worse tomorrow in San Jacinto?
On 16 July 2026, air quality conditions in San Jacinto will be similar to today, with AQI forecast at fair at 29.7/100. Pollution peaks around 9:00 AM (O3: 29.7/100).
When is air pollution at its worst in San Jacinto?
Air quality across San Jacinto rises and falls with the seasons, as winter typically brings the cleanest stretch, once occasional rain clears the basin; by contrast, from August into October, wildfire smoke can add sharp particulate spikes on top of the usual summer ozone. The mountains ringing the basin can trap pollution close to the ground for days when winds are calm.
Are air quality levels in San Jacinto 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