Southern California Edison says high heat is not the only factor it monitors. The utility also tracks dry vegetation and humidity levels at its emergency operations center in Irwindale to determine if a public safety power shutoff is necessary to prevent wildfires.

The report, released this week, found that 58% of fast-food workers surveyed in July said they had worked in excessive heat conditions in the last year. And nearly half, or 48%, reported experiencing heat illness symptoms including headaches, fatigue, dizziness, confusion, muscle pain or nausea.

Orange County firefighters rushed to a Laguna Niguel neighborhood to extinguish flames burning near homes.