In the Bay Area masks are required indoors and outdoors whenever within 30 feet of people. For apartment dwellers there’s been no way to legally enjoy fresh air for the last 10 months.
> • Sitting or standing outside alone or with people you live with (such as picnicking outside) and you are more than 6 feet from others; • When eating or drinking alone or with people you live with, and nobody else is within 6 feet; • Exercising outdoors alone or with people who live with you (walking, hiking, bicycling, or running) and no one else is within 6 feet
Realistically though, there is no enforcement anywhere outside. If you want to go walking or running around outside on the sidewalk without a mask, nobody is going to stop you. You might get a funny look. If you crowd someone's personal space without a mask they might be uncomfortable.
Please wear your mask if you plan to spend extended stretches of time near other people.