Last week, several San Francisco Bay Area counties and cities announced new ordinances requiring residents to wear face masks in certain places in an attempt to prevent the spread of the novel coronavirus. So, what exactly do these new rules entail? ABC7 decided to find out the answer to seven common questions about the new ordinances. Where in the Bay Area are they mandatory? Five counties and three cities: Contra Costa, Alameda, San Mateo, and Marin Sonoma.San Francisco, Pl