BART trains on the Dublin-Pleasanton line were stopped Monday afternoon due to a natural gas odor, a spokeswoman said.
Firefighters were at the scene of a hazardous materials incident at a post office in Vallejo Thursday afternoon.
A Southwest Airlines flight returned to Oakland International Airport about 15 minutes after taking off Tuesday morning after a flight attendant reported a strange odor on board, an airport spokeswoman said.
Air readings show the leak from the 16-inch pipeline does not pose a significant health threat but is releasing a sulfurous odor. However, when the repair process begins, the odor may intensify.
A strong smell of gas forced PG&E crews to halt excavations around a natural gas transmission pipeline in San Bruno on Saturday, a spokesman said Sunday.
PG&E crews completed their search Thursday afternoon for the source of an odor at the Walnut Creek courthouse that was thought to be natural gas, but found no gas leak anywhere in the area.