freight

Pugh said he heard hissing before the explosion and then a roaring sound similar to a freight train that lasted for about 30 minutes.

After going to art school and hopping freight trains for several years, he moved to Los Angeles in 2002 originally to join the Merchant Marines.

Diesel freight pollution has long hit hardest in low-income neighborhoods and communities of color near ports, warehouses and freight corridors, causing higher rates of asthma, heart disease and cancer.

The trucks keep rolling on Highway 99 in California, the route bustling with freight traffic through the Central Valley.

It could also help clean up the port, which has long struggled with pollution issues linked to ship engines, diesel trucks and other freight equipment that spews particulate matter into the air.