Worst air pollution Chinatown - San Francisco, today and tomorrow

On 9 August 2026, overall air quality in Chinatown is fair. AQI is the main air quality indicator at 30.1/100. Pollution peaks around 6:00 AM (O3: 30.1/100).

On 10 August 2026, air quality conditions in Chinatown will be similar to today, with AQI forecast at fair at 34.8/100. Pollution peaks around 11:00 PM (O3: 34.8/100).

At Chinatown, air quality tends to follow San Francisco's broader seasonal rhythm, as late winter and spring tend to have the cleanest conditions, once winter rains settle in; by contrast, heat and dryness combine from July onward to raise both ozone and smoke risk. Wine country and inland valley locations tend to see more smoke buildup than the immediate coast.

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.

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.