A large trash-pickup business has replaced 53 of its older diesel trucks in the Charleston region with new haulers that run on cleaner compressed natural gas.

Republic Services Inc. said today that the switch “represents a significant local investment in cleaner, safer and more efficient vehicles.”

The company said it also installed a natural gas fueling station for the new fleet of solid-waste trucks.

“We believe it is our responsibility to reduce ozone-forming emissions wherever possible,” said James Amick, the company’s president for the Charleston area.

Nationwide, Phoenix-based Republic Services said it now has 1,400 natural-gas vehicles and 26 fueling stations.

The company has 180 employees in the Charleston region, where it serves more than 34,500 residential and 5,000 commercial customers. Through its subsidiaries, Republic has been operating in the area for 38 years.