International Truck and Engine Corp. says research funded by the company shows its new-generation Green Diesel Technology turbodiesel engines for school buses emit fewer "pollutants and toxic air contaminants" than do school buses fitted with engine burning compressed natural gas. International says the Green Diesel buses did emit more nitrogen dioxide and carbon dioxide than CNG-fueled buses, but emitted less of the four "criteria pollutants" – oxides of nitrogen, carbon monoxide, ...

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