Worst air pollution Daly City, today and tomorrow
Today (15 July): Air quality in Daly City is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 8:00 AM (O3: 39.4/100).
Tomorrow (16 July 2026): Air quality in Daly City is fair. AQI improves to medium; PM2.5 increases to fair; O3 decreases to medium; all other pollutants stay as today. Pollution peaks around 10:00 AM (O3: 41.0/100). Airmine updates local air quality forecasts four times daily.
For long term forecasts and maps, see the Airmine app
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Daly City's air quality benefits from its direct Pacific Ocean and San Francisco Bay exposure on the San Francisco Peninsula, with consistent marine layer and Bay breezes providing reliable maritime ventilation across this densely populated San Mateo County suburb. Vehicle emissions from I-280 and the BART/Caltrain corridor are the primary local sources, while the coastal position generally maintains better conditions than the enclosed eastern Bay Area municipalities throughout the year.
Today - 15 July | Pollution peaks at 08:00
AQI:
Fair
39.4/100
PM2.5 (fine particles):
Good
16.1/100
PM10 (coarse particles):
Good
9.9/100
NO2 (nitrogen dioxide):
Good
9.2/100
O3 (ozone):
Fair
39.4/100
SO2 (sulfur dioxide):
Good
4.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.2/100
PM1 (ultrafine particles):
Good
8.8/100
Levels show the poorest local air quality during the day
Tomorrow - 16 July | Pollution peaks at 10:00
AQI:
Medium
41.0/100
PM2.5 (fine particles):
Fair
22.0/100
PM10 (coarse particles):
Good
10.9/100
NO2 (nitrogen dioxide):
Good
19.8/100
O3 (ozone):
Medium
41.0/100
SO2 (sulfur dioxide):
Good
4.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
1.9/100
PM1 (ultrafine particles):
Good
14.7/100
Pollen forecast in Daly City
View pollen forecastFrequently Asked Questions
Is air quality bad in Daly City right now?
On 15 July 2026, overall air quality in Daly City is fair. AQI is the main air quality indicator at 39.4/100. Pollution peaks around 8:00 AM (O3: 39.4/100).
Will air quality be worse tomorrow in Daly City?
On 16 July 2026, air quality conditions in Daly City will be similar to today, with PM2.5 forecast at fair at 22.0/100. Pollution peaks around 10:00 AM (O3: 41.0/100).
When is air pollution at its worst in Daly City?
Like most US cities, Daly City sees air quality shift from season to season, as winter typically brings the cleanest stretch, once occasional rain clears the basin; by contrast, 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 Daly City 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