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...
Emissions Update: No More Tiers
Diesel manufacturers are delivering off-road equipment that meets Tier 4 Final standards. Two suppliers explain what’s changed — and what hasn’t.
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