Crews responded to a reported chemical leak in a La Habra neighborhood, where nearby residents were temporarily asked to shelter in place.
A crash involving a truck carrying pool chemicals blocked several lanes of SR-23 in Thousands Oaks, according to the California Highway Patrol.
A high-pressure pump system at the Chiquita Canyon landfill in Castaic malfunctioned, resulting in a hazardous spill.
A hazmat team responded to an area near L.A. Live after a worker in the area became ill from fumes emanating from a 55-gallon drum, according to authorities.
A hazardous materials situation prompted the closure of all eastbound lanes on the 60 Freeway in Chino, snarling traffic in the area as the morning commute got underway.
Seven people were hospitalized following a chlorine spill at a pool supply business in Saugus, authorities said.