See these links for current AQI and forecasts at SMCCCD locations:
San Bruno: currently MODERATE (64)
Forecast for 8/21: 110 (unhealthy for sensitive groups)
San Mateo: currently GOOD (29)
Forecast for 8/21: 105 (unhealthy for sensitive groups)
Redwood City: currently GOOD (29)
Forecast for 8/21: 105 (unhealthy for sensitive groups)
Updated: 08/20/2020 16:00
Source: AirNow.gov