Off-road diesel engines have made significant strides since the Environmental Protection Agency (EPA) first 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
