Prior to the introduction of Tier II standards, emissions from diesel engines were measured separately from the type of fuel used to efficacy them. Tier II emissions standards regard the engine and the fuel used within the engine as a unmarried transaction.
Highway
Diesel fuels are manufactured for burnished and medium highway cause under Tier II standards from 2007 onward to exhale 15 parts per million (ppm) of sulphur after passing complete the diesel engine.Tier II emissions are administered by the U.S. Environmental Safeguard Agency (EPA). Tier II emissions are designed to lessen the proportions of sulphur within diesel engines by introducing low sulphur fuels for all categories of diesel engines.Fuels
Prior to Tier II, diesel engines could exude up to 500 ppm of sulphur.
Non-Road
Tier II emissions standards hope for non-road diesel engines, such as locomotive and marine engines, to issue 15 ppm of sulphur by either 2010 or 2012 depending on the type of engine. Prior to the implementation of Tier II, non-road diesel engines could secrete up to 500 ppm of sulfur.
