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A recent UCLA study analyzed the performance of retrofit systems for diesel-fueled school buses and discovered the systems significantly reduce tailpipe emissions, but had no measurable effect on in-cabin pollution.

Following EPA grants for retrofitting buses in Detroit and Fort Wayne, the Tuscola Intermediate School District in Caro, Michigan will receive $50,000 to retrofit their buses and buy biodiesel. Three nearby school districts (Cass City Public Schools, Cass City; Vassar Public Schools, Vassar; and Millington Community Schools, Millington) will also get to use some of the grant money for their own buses. A total of 75 buses will be affected, but only 24 will get diesel oxidation catalysts (the rest