The timing also would mean higher costs for rebuilding efforts in L.A. County communities destroyed by wildfires.

What we’re really worried about is the PM2.5 levels,” or the fine particles in wildfire smoke, which have a diameter of less than 2.5 micrometers. In order for particles to enter your lungs’ air sacs, ...

Jeffrey Mount is a senior fellow at the Public Policy Institute of California’s Water Policy Center. Brett Sanders is a professor of civil and environmental engineering, urban planning and public ...