Worst air pollution Santa Ana, today and tomorrow
Today (15 July): Air quality in Santa Ana 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 Santa Ana 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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Santa Ana's air quality reflects the Santa Ana Valley's enclosed position in the Orange County portion of the Los Angeles basin, sharing the region's notorious temperature inversion problem with concentrated vehicle emissions from I-5 and CA-55 and the dense urban character of one of California's most densely populated cities. The Santa Ana River corridor provides limited ventilation, while Santa Ana wind events paradoxically name this location but temporarily worsen the already-challenging air quality.
Today - 15 July | Pollution peaks at 07:00
AQI:
Fair
30.4/100
PM2.5 (fine particles):
Good
13.7/100
PM10 (coarse particles):
Fair
21.9/100
NO2 (nitrogen dioxide):
Good
0.1/100
O3 (ozone):
Fair
30.4/100
SO2 (sulfur dioxide):
Good
0.2/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
0.9/100
PM1 (ultrafine particles):
Good
2.5/100
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
11.1/100
PM10 (coarse particles):
Good
18.9/100
NO2 (nitrogen dioxide):
Good
0.1/100
O3 (ozone):
Fair
29.7/100
SO2 (sulfur dioxide):
Good
0.3/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
0.9/100
PM1 (ultrafine particles):
Good
2.5/100
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Frequently Asked Questions
Is air quality bad in Santa Ana right now?
On 15 July 2026, overall air quality in Santa Ana 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 Santa Ana?
On 16 July 2026, air quality conditions in Santa Ana 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 Santa Ana?
Santa Ana sees air quality change through the year. In short, the shortest stretch of clean air usually falls in the wetter winter months, whereas 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 Santa Ana 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