The map below, updated hourly, shows air quality levels across broad areas in the Bay Area. AirNow is also running a pilot project that adds data from low-cost sensors to a fire and smoke map. The Bay Area air district lists current and recent AQI from individual monitoring stations. Here is how to protect yourself from wildfire smoke.
Below is an interactive, crowdsourced air quality map from the private company PurpleAir, which relies on commercially sold sensors for its data. Note that these sensors tend to run higher than the EPA-approved monitors used by the BAAQMD.
Here is an expanded list of other air quality measurement resources: