Worst air pollution Brentwood, today and tomorrow
Today (9 August): Air quality in Brentwood is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 6:00 AM (O3: 32.2/100).
Tomorrow (10 August 2026): Air quality in Brentwood is fair. All pollutants stay as today. Pollution peaks around 5:00 AM (O3: 37.0/100). 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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Brentwood's air quality in California reflects the San Joaquin Delta position east of the Bay Area, with vehicle emissions from SR-4 and the surrounding East Contra Costa County agricultural and suburban development contributing local sources. The San Joaquin Delta breeze from San Francisco Bay provides afternoon ventilation on most summer days, while summer wildfire smoke from surrounding hills is an increasingly frequent seasonal concern and summer ozone from the broader valley corridor elevates warm-season readings.
Today - 9 August | Pollution peaks at 06:00
AQI:
Fair
32.2/100
PM2.5 (fine particles):
Good
13.4/100
PM10 (coarse particles):
Good
5.0/100
NO2 (nitrogen dioxide):
Good
4.6/100
O3 (ozone):
Fair
32.2/100
SO2 (sulfur dioxide):
Good
1.8/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.1/100
PM1 (ultrafine particles):
Good
9.1/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 05:00
AQI:
Fair
37.0/100
PM2.5 (fine particles):
Good
10.8/100
PM10 (coarse particles):
Good
4.7/100
NO2 (nitrogen dioxide):
Good
2.7/100
O3 (ozone):
Fair
37.0/100
SO2 (sulfur dioxide):
Good
1.7/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.0/100
PM1 (ultrafine particles):
Good
7.3/100
Pollen forecast in Brentwood
View pollen forecastFrequently Asked Questions
Is air quality bad in Brentwood right now?
On 9 August 2026, overall air quality in Brentwood is fair. AQI is the main air quality indicator at 32.2/100. Pollution peaks around 6:00 AM (O3: 32.2/100).
Will air quality be worse tomorrow in Brentwood?
On 10 August 2026, air quality conditions in Brentwood will be similar to today, with AQI forecast at fair at 37.0/100. Pollution peaks around 5:00 AM (O3: 37.0/100).
When is air pollution at its worst in Brentwood?
Air quality across Brentwood rises and falls with the seasons — winter rains provide the only real relief from an otherwise persistent haze, whereas 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 Brentwood 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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