3.0 Affected Environment - Knik Arm Bridge and Toll Authority

Knik Arm Crossing DraftFinal EIS
Affected Environment
Beginning later in 2006, the on-road diesel fuel sulfur limit will drop to 15 ppm and the
nonroad diesel fuel limit will drop to 500 ppm. In 2011, the nonroad diesel fuel sulfur limit
will also drop to 15 ppm. Because most PM 2.5 is related to combustion sources and because a
significant portion of the PM 2.5 emissions from fuel combustion is related to sulfur, these
new rules will drive PM 2.5 emissions lower nationwide. In addition, starting in 2007, new
USEPA standards will require on-road trucks to reduce emission rates of NO x and PM by
90 percent from the prior-year standards.
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