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The Smog Check program
divides the state into three different types of areas depending on the
severity of the smog problem in that area. These areas, Enhanced, Basic,
and Change-of-Ownership Areas, may require different Smog Check inspection
equipment and different licenses. The area in which a vehicle is registered
will determine which type of test a vehicle needs; the area in which a
station is located will determine which licenses the technician needs to
possess and what equipment a station must have to test vehicles in its
area. The
ZIP Code locator function on this www site can be used to determine in
which type of area a station is located or a vehicle is registered.
Areas of the State
All areas of California require Smog Check inspections when a vehicle
changes ownership or is registered for the first time in California. Most
areas also require testing every two years, at the time of registration
renewal. The Smog Check program divides the state into three areas, with
different requirements for each:
Enhanced Areas: These areas do not meet federal or state air
quality standards for ozone and carbon monoxide and are California's
smoggiest urbanized areas. Biennial Smog Checks are required here. Fifteen
percent (15%) of the vehicles in these areas must have their biennial Smog
Checks performed at Test-Only stations.
Basic Areas: Vehicles in these less-smoggy areas must have
biennial testing at licensed test-and-repair stations.
Change of Ownership Areas: These
more rural areas of the state require emissions testing only when a vehicle
changes ownership or are registered for the first time in California.
Testing Equipment
New Equipment in Enhanced Areas: Enhanced
Area stations use new equipment called the BAR-97 Emissions Inspection
System (EIS), which uses a treadmill-like device called a dynamometer to
simulate actual driving conditions. BAR-97 measures oxides of nitrogen
(NOx), hydrocarbons (HC), and carbon monoxide (CO). Large trucks, some
four-wheel drive vehicles, and some vehicles with traction control will
continue to receive BAR-90 inspections.BAR-90: Vehicles
registered in Basic and Change of Ownership Areas continue to be tested on
a BAR-90 system that performs a 2-speed idle test which identifies HC and
CO levels only.
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