State school buses faulted on emissions.

Byline: Andrea Kelly

May 25--Despite "above average" efforts to reduce soot emissions from school buses, Arizona still scored a D in a recent national study on school bus pollution. A D was the lowest score possible, which puts Arizona in the bottom group of states in terms of the amount of soot pollution from school buses. No state earned an A. Arizona school buses produce more than twice as much soot per mile as a big rig, the report stated. The "above average" rating for Arizona's cleanup programs was given to those that reduced soot pollution by 2.6 percent to 7 percent. Arizona's rating was based on the state's 3.2 percent reduction in soot emissions in …