EPA Tier IV Final Emissions Regulations

Posted on June 3, 2015

On May 11, 2004, the Environmental Protection Agency (EPA) signed the final rule introducing Tier IV emission standards, which phased-in over the period of 2008-2015. The Tier IV standards requires that emissions of PM be reduced by approximately 90% and NOx by approximately 37%.

January 1, 2013 was the effective compliance date for the Tier IV Final emissions standard. To meet the new standard, transport refrigeration unit
(TRU) diesel engines required advanced emission-control technologies similar to those found on current truck and tractor engines.

EPA Regulations Chart