California contractors, mired in the initial compliance with the Air Resources Board's In-Use Off-Road Diesel Emissions Regulation, are paying scant attention to the sister rule regulating in-use on-road diesel emissions. The off-road rule's shifting requirements have demanded some strategy adjustments and the on-road rule, known as the statewide truck and bus rule or, officially, the Die- sel Particulate Matter and Oxides of Nitrogen and Greenhouse Gases Control Measure for On-Road Heavy-Duty Diesel-Fueled Vehicles, appears to be no less time consuming.
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