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Detroit Diesel will spend over $28M to clean up NOx other pollutants.

The fine is equivalent to $3,660 per uncertified diesel engine.

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.

Last week, the Pittsburgh Healthy School Bus Fund announced it will begin retrofitting Pittsburgh Public Schools' diesel school buses with filtering devices to reduce particulate emissions by up to 85 percent. The initial grant, $500,000 from the Heinz Endowments, will begin work on some of Pittsburgh's 350 buses, and future funding might come from the Pennsylvania Department of Environmental Protection, the Allegheny County Health Department, and the Environmental Protection Agency.

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