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The federal agency has proposed changes to next year’s targets that would eliminate DEF derates, ease warranty requirements, and retain current NOx emissions standards.
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Pulaski County Special School District replaced 14 outdated diesel buses with cleaner propane models. Here
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EPA said its new emission standards for oxides of nitrogen (NOX) from medium- and heavy-duty on-highway engines are more than 80% stronger than current standards.
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