Bay Area residents will be banned from burning wood for the 11th straight day on Wednesday (Dec. 18).
The Bay Area Air Quality Management District issued a "Winter Spare the Air" alert for Wednesday, the 15th since its winter season began on Nov. 1.
The air district issues alerts and bans wood burning indoors and outdoors on days when it deems air pollution has risen to unhealthy levels in the region.
An ongoing cold weather pattern in the Bay Area has prompted the unprecedented string of consecutive Winter Spare the Air alerts, according to the district, which said Tuesday morning's fire at a recycling facility in Redwood City likely contributed to the elevated pollution levels.
District officials said the cold weather system is expected to weaken later this week, with increasing winds likely to help reduce pollution below unhealthy levels on Thursday.
Only homes without permanently installed heating are exempt from the wood-burning ban.
First-time violators are given the option of taking a wood smoke awareness class in lieu of paying a $100 fine. Subsequent violations result in higher fines.