Nationwide, there is an environmental justice disparity between White and African American citizens. What is the root cause? Air pollution from diesel in the transportation sector. School and city buses, trash trucks, 18-wheelers, and off-road construction vehicles, are among the many fluxes of emissions from the transportation sector. Studies show, 60% of California’s, 52% of DC’s and 20% of New York State’s greenhouse gas (GHG) emissions are from diesel combustion engines.