Off-road diesel engines have made significant strides since the U.S. Environmental Protection Agency adopted Tier 1 emission standards in 1994. Tier 4 standards have been phased in since 2008, with the strictest Tier 4 Final requirements to reduce nitrogen oxides (NOx) and particulate matter (PM) incorporated last year and this year.However, Tier 4 Final standards are outcome-based, not prescriptive — each manufacturer is permitted to achieve outcomes using its own solutions and technology. On hand to discuss their approaches are Joe Mastanduno, account manager, rental marketing, with John Deere’s Construction and Forestry Division, and Brad Stemper, solutions marketing manager with
