Worst air pollution Winchester Mystery House - San Jose, today and tomorrow

On 9 August 2026, overall air quality in Winchester Mystery House is fair. AQI is the main air quality indicator at 28.1/100. Pollution peaks around 9:00 AM (O3: 28.1/100).

On 10 August 2026, air quality conditions in Winchester Mystery House will be similar to today, with AQI forecast at fair at 35.5/100. Pollution peaks around 7:00 AM (O3: 35.5/100).

This landmark in San Jose sees air quality shift through the year. In short, winter storms periodically reset air quality, keeping the cleanest stretch to the rainy months, whereas summer and early autumn bring the highest risk, with heat-driven ozone and wildfire smoke both peaking from July through October. Dry summer conditions with virtually no rain mean pollution and smoke can linger for extended stretches once they arrive.

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.