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The California Air Resources Board (ARB or Board) has posted TRU
Advisory 12-24 on the TRU Website. 

TRU Advisory 12-24 explains issues related to purchasing
transport refrigeration units (TRU) equipped with flexibility
engines after the Tier 4 Final (Tier 4f) new engine emissions
standard for 25 to 50 horsepower (hp) engines goes into effect in
2013.

More detailed information is provided in TRU Advisory 12-24,
which is posted on the TRU Website at: 
http://www.arb.ca.gov/diesel/tru/tru.htm.

Background:  TRUs are refrigeration systems powered by integral
diesel internal combustion engines designed to control the
environment of temperature-sensitive products that are
transported in trucks, trailers, shipping containers, and
railcars.  The emissions from these units are a source of
unhealthful air pollutants including particulate matter, toxic
air contaminants, nitrogen oxides, carbon monoxide, and
hydrocarbons, and pose a potential threat to both public health
and the environment. These units often congregate in large
numbers at California distribution centers, grocery stores, and
other facilities where they run for extended periods of time to
ensure their perishable contents remain cold or frozen. These
distribution and loading facilities are often in close proximity
to schools, hospitals, and residential neighborhoods.  In 2004,
the TRU Regulation was adopted by the Board to reduce diesel
particulate matter emissions from TRUs and TRU generator set
engines.  Amendments were adopted by the Board in November 2010
and October 2011.

Questions related to the TRU ATCM, TRU Advisory 12-24, or
registration of TRUs in ARB’s Equipment Registration (ARBER)
system may be emailed to arber@arb.ca.gov or called in to the TRU
Help Line at:  1-888-878-2826.