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HD sector braces for tighter NOx control

OEMs and suppliers are preparing for further tightening of emissions controls, with a particular focus on NOx. By Alan Bunting

On both sides of the Atlantic, regulations controlling oxides of nitrogen (NOx) exhaust pollutants from diesel trucks and buses are ahead of corresponding light-duty emissions legislation. Euro VI and EPA 2010 rules already include ISC (in-service compliance) testing, using PEMS (portable emission measuring system) equipment, of exhaust gas samples from working heavy-duty vehicles. They are taken under cold-start and light-load running conditions, when selective catalytic reduction (SCR) catalysts are below optimum temperature. 

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