The move marks the final step in the company’s plan to convert its private fleet operation from diesel to CNG.

Around 75% of the company’s fleet has been converted from diesel to CNG in the past 18 months.

99 Cents Only Stores Transportation director David Townsend said: "53 of our trucks have converted to CNG making us the largest private retail Class 8 CNG fleet in California."

The company’s 53 CNG trucks will drive approximately 3.7 million miles, reducing greenhouse gas emissions by 6,500 metric tons over the next seven years, the company said.

The development of the CNG filling station was backed by Mobile Source Air Pollution Reduction Review Committee, Southern California Gas Company, the City of Commerce and the Fire Department.