Still a mystery light….
Check it out:

People across the Bay Area reported seeing a streak of light shoot across the sky Friday around 6 a.m. said about 30 residents saw a white light with fog or smoke billowing out.

“I am used to seeing planes early in the morning with lights, but this was different,” said one bystander. “This had something coming out of it, it wasn’t just the light. I could see it spraying something.”

Mosquito fogging in Contra Costa County isn’t done by air, but by truck, and there were no plans to fog for mosquitoes in the area.