Black smoke pours into the sky from a massive commercial fire at the Medline Industries medical supply warehouse in Tracy, Calif., on June 11, 2026. 

Public health officials are warning residents in San Joaquin County to take precautions after toxic chemicals were set ablaze at a massive warehouse fire in Tracy that began on Thursday. Thirty-five engines and 120 firefighting personnel responded to the inferno at the million-square-foot warehouse, authorities said. The fire gave off smoke so intense it could briefly be seen in space by NOAA satellites.

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.

Article continues below this ad

“Among the chemicals that were consumed in the Medline fire were an assortment of respiratory irritants, toxic gases, carcinogens, and at least........

© SFGate