EPA's update to the Cross State Air Pollution Rule is
designed to address interstate transport issues under the 2008
ozone standard. The rule establishes Federal Implementation Plans
(FIPs) for 22 states in the eastern half of the U.S. (see map
below) and requires ozone season NOx reductions directly from
fossil fuel fired Electric Generating Units (EGUs) in those states.
The rule is styled as an "update" to the Cross State Air
Pollution Rule because it uses the same regulatory frameworks, with
some updates, as EPA's original Cross State Air Pollution Rule,
which was finalized in 2011, vacated by the DC Circuit but
ultimately upheld by the Supreme Court. Most of the states subject
to the CSAPR Update rule were also subject to the original CSAPR
rule with the exception of Kansas, which will be new to the ozone
season NOx program under the CSAPR Update Rule. The rule
establishes new, more stringent ozone season NOx emissions budgets
for each state subject to the rule, and
