"Most vehicles with diesel engines are also exempted. However, diesel-powered vehicles that weigh more than 8,500 lbs. and are registered in the New York Metropolitan Area (NYMA) counties of Nassau, Suffolk, Rockland, Westchester, and the five counties within New York City, are
subject to annual emissions inspection. All diesel-powered vehicles over 8500 lbs. GVWR operated in New York State, even if registered elsewhere, are subject to roadside inspections. These safety and equipment inspections are conducted randomly statewide by the New York State Police and the New York State Department" of Transportation."
link to PDF file:
NY State DMV Inspections
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