Snuggling by a fireplace or fire pit will be banned on winter nights under a new rule approved Wednesday.

The 1.2 million Bay Area wood-burning devices, which include fireplaces and wood-burning stoves, create one-third of wintertime particulate air pollution, according to a report by Jack Broadbent, executive officer of the Bay Area Air Quality Management District. Banning wood-burning on Spare the Air nights could prevent more than 700 tons of soot from being released into the air, according to the report.