Your recent editorial, "Without Clean Fuel, Builders Will Be Running on Empty," opines that retrofitting construction equipment is "not a big deal," and the old phrase, "money talks," will dictate how the construction industry deals with the millions of legacy diesels that will not get scrapped for many years (ENR 8/15 p. 52).
The California Air Resources Board (CARB) staff is working with the Construction Industry Air Quality Coalition (CIAQC) and other stakeholders to develop a control measure that will reduce particulate matter emissions from in-use off-road diesel engines. The proposed measure could include purchasing new equipment, repowering existing machines with Tier 2 and higher engines and retrofitting with particulate filters and other verified control devices. Its goal is to reduce particulate emissions by 75% by 2010 and 85% by 2020. The control measure is scheduled to go to CARB for adoption late next year.