Red is being described as the new green in San Antonio.

VIA Metropolitan Transit debuted the first five in a fleet of new buses that run on compressed natural gas, or CNG, during a Thursday morning event at the Medical Center Transit Center.

The buses unveiled on Thursday — painted in VIA’s signature colors of red and white — are the first five of 270 that the transportation agency is buying as part of its switch from using diesel as a fuel to natural gas, CEO Jeffrey Arndt told the Business…