Grande West Transportation Group Inc. announced a major addition to clean air propulsion options for its Vicinity bus line. Grande West is now offering clean burning, low emission Cummins ISB G engines for delivery on 2017 orders. The ISB G Engine, powered by compressed natural gas (CNG) has the lowest North American Emissions standards and is approved from both the US Environmental Protection Agency (EPA) and Air Resources Board (ARB) in California. This certification represents major emissions reduction well below current EPA nitrogen oxide (NOx) emissions standards providing the cleanest engine in the bus industry. The engine also greatly reduces Particulate Matter (PM) providing major greenhouse gas benefits.