Two burning tankers full of roofing material kept Riverside County firefighters battling flames through most of the early morning hours in Perris on Sunday, authorities said.
The Los Angeles Unified School District is among several Southern California school districts that will go under an environmental microscope.
A chemical spill was reported Monday in an industrial area in Monrovia, prompting response from a hazardous-materials team and paramedics.
Wal-Mart will pay $81.6 million after pleading guilty to criminal charges of improperly disposing of fertilizer, pesticides and other hazardous products that were pulled from stores in California and Missouri because of damaged packaging.
A tanker truck leak spilled some type of chemical onto a Carson roadway Wednesday afternoon, which prompted a hazardous materials situation.
A man arrested at Los Angeles International Airport last week wearing body armor was ordered Friday morning to remain in jail until a trial scheduled later this month.
A worker at a hazardous materials sorting facility in Inglewood had to be hospitalized Monday when a canister released an unknown material that had dozens of people complaining of eye irritation.
A driver rammed his vehicle into a social services building in Orange Monday night before throwing vials of an unknown substance.
A Union Pacific freight train carrying hazardous materials derailed in Littlerock, prompting the evacuation of dozens of nearby residents.
Crude oil has seeped from beneath a busy street in Huntington Beach, forming a dark puddle that has halted traffic.