Cleanng The Air

摘要

Initiated in 1996, the federal government's drive to clean up diesel engine emissions enters another timetable this year and impacts many machines used in forestry, construction, agriculture and other industrial applications. The development follows final implementation of similar regulations last year for on-road applications. The upside: cleaner air; the downside: higher costs. As of January 1, manufacturers of off-road diesel equipment in the 174 to 750 horsepower class are required to meet EPA'sTier 4 interim (T4i) engine emission regulations on all new machines (pursuant to the Clean Air Act of 1970). As in previous standards, EPA has allowed a multi-year phase-in period culminating with the Tier 4 final (T4f) standards effective in 2014.