CARB approves $28M investment in clean trucks, cars The California Air Resources Board approved $28 million in Air Quality Improvement Program (AQIP) funding to support two popular statewide incentive programs aimed at bringing the cleanest vehicle technologies to low-income and underserved communities. California’s Hybrid and Zero-Emission Truck and Bus Voucher Incentive Project (HVIP) provides incentives to purchase the cleanest medium- and heavy-duty trucks, and Clean Cars 4 All incentivizes lower-income California drivers to scrap their older, high-polluting cars and replace them with zero-emission, plug-in hybrid or hybrid vehicles. Each of these vehicle-purchase incentive programs helps businesses and individuals make the switch to clean vehicles and helps grow the market for these technologies.