Live update on the Tracy warehouse fire. Officials discuss fire suppression efforts, air quality concerns, and long-term recovery plans.

Winds have pushed smoke away from the Bay Area toward the San Joaquin Valley a day after the Tracy blaze broke out. Toxins remained aloft but smoke may encroach on ground level in the coming days.

Fire erupted on the roof of a medical supply warehouse in Tracy, Calif.

A large warehouse fire in Tracy is generating significant smoke that may affect air quality in portions of the San Joaquin Valley in the next few days, according to the Air Pollution Control District.

Tracy residents affected by the Medline warehouse fire can make a DIY air purifier using three items. Here's what to know when making an air purifier.

A large plume of black smoke can be seen in Tracy as emergency personnel respond to a structure fire along Promontory Parkway on Thursday afternoon.

San Joaquin County officials cautioned residents to remain indoors with the windows and doors shut if smoke is in the area, as the warehouse, which housed medical supplies for the company Medline, contained toxic materials and dangerous chemicals.

Tracy warehouse fire: Air alert issued for Modesto, Merced, Fresno and Kings counties