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Hazardous air pollutants (HAPs) – chemicals that cause
serious health and environmental effects. Health effects include
cancer, birth defects, nervous system problems and death due
to massive accidental releases such as occurred at the pesticide
plant in Bhopal, India. HAPs are released by sources such as
chemical plants, dry cleaners, printing plants, and motor vehicles
(cars, trucks, buses, etc.)
HDDE – means a heavy-duty diesel engine. A diesel
engine that is used to propel a heavy-duty diesel vehicle.
HDDV – means heavy-duty diesel vehicle. A motor vehicle
with a GVWR greater than 14,000 pounds that is equipped with
a heavy-duty diesel engine.
HDGV – means heavy-duty gasoline vehicle. A gasoline-fueled
motor vehicle that has a GVWR exceeding 8,500 pounds and is
designed primarily for transporting persons or property.
HP – means horsepower.
Hydrocarbons (HC) – means any compound or mixture of
compounds whose molecules consist of atoms of hydrogen and