Worst air pollution Escondido, today and tomorrow
Today (9 August): Air quality in Escondido is fair. AQI, PM10, and O3 are fair; PM2.5, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 4:00 AM (O3: 23.2/100).
Tomorrow (10 August 2026): Air quality in Escondido is fair. PM10 decreases to good; all other pollutants stay as today. Pollution peaks around 9:00 AM (O3: 21.0/100). Airmine updates local air quality forecasts four times daily.
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Escondido's air quality reflects San Diego County's inland valley position, with vehicle emissions from I-15 and the surrounding commercial agriculture and wine country operations contributing local sources. The San Diego coastal air quality advantage weakens significantly with distance from the ocean, and Escondido's inland position means it experiences more temperature inversion episodes and higher ozone concentrations than the coastal San Diego suburbs, while occasional Santa Ana wind events from the east can temporarily worsen already elevated inland valley conditions.
Today - 9 August | Pollution peaks at 04:00
AQI:
Fair
23.2/100
PM2.5 (fine particles):
Good
15.4/100
PM10 (coarse particles):
Fair
20.6/100
NO2 (nitrogen dioxide):
Good
2.5/100
O3 (ozone):
Fair
23.2/100
SO2 (sulfur dioxide):
Good
1.8/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
1.1/100
PM1 (ultrafine particles):
Good
5.6/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 09:00
AQI:
Fair
21.0/100
PM2.5 (fine particles):
Good
14.6/100
PM10 (coarse particles):
Good
15.3/100
NO2 (nitrogen dioxide):
Good
6.9/100
O3 (ozone):
Fair
21.0/100
SO2 (sulfur dioxide):
Good
1.9/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
1.4/100
PM1 (ultrafine particles):
Good
5.8/100
Pollen forecast in Escondido
View pollen forecastFrequently Asked Questions
Is air quality bad in Escondido right now?
On 9 August 2026, overall air quality in Escondido is fair. AQI is the main air quality indicator at 23.2/100. Pollution peaks around 4:00 AM (O3: 23.2/100).
Will air quality be worse tomorrow in Escondido?
On 10 August 2026, air quality conditions in Escondido will be similar to today, with AQI forecast at fair at 21.0/100. Pollution peaks around 9:00 AM (O3: 21.0/100).
When is air pollution at its worst in Escondido?
Escondido follows a fairly predictable seasonal air quality pattern: winter typically brings the cleanest stretch, once occasional rain clears the basin, but summer sunshine and heat drive some of the worst ozone readings in the country. Coastal breezes offer some relief compared to inland valley locations that see heavier smog buildup.
Are air quality levels in Escondido 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: 9 August 2026 at 20:27 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.
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