We have been having some degree of smoke cover here in the San Francisco Bay area for some time, and today it is particularly bad. I have found a map of smoke coverage for all of California and even Nevada that calculates the coverage at the time you click the map. I can’t seem to embed this map, but it is worth clicking through — especially if you live in one of the affected areas. Here it is:
WunderMap Interactive Radar & Weather Stations : Wunderground Preview Site