A $400,000 settlement between Halliburton Energy Services, Inc. and the U.S. Environmental Protection Agency was announced Thursday after the company used a fleet of diesel trucks that violated California’s Truck and Bus Regulation.

The company will spend $75,000 on air quality improvements in the San Joaquin Valley, $180,600 on environmental projects to reduce air pollution at Los Angeles area schools, and pay a $154,400 civil penalty.

Halliburton operated 61 diesel trucks in California from 2012 to 2014 without the required diesel particulate filters and failed to verify compliance with the Truck and Bus Regulation for its hired motor carriers.