Comment submitted by Anonymous

I strongly support the proposed changes to Tier 2 to encourage introduction of more light-duty diesel vehicles in the U.S. Furthermore, the "weekend ozone effect" studies suggest that VOCs are more important ozone precursors than NOx. Diesels are inherently very low in VOC (NMHC) emissions and have near-zero evaporative VOC emissions. Therefore, I anticipate a net positive influence on air quality with increased diesel market penetration, not to mention the diesel advantage in CO2 emissions. Any provision which encourages manufacturers to introduce additional diesel models is to be commended.