Regional Transport of Ozone
Note: EPA no longer updates this information, but it may be useful as a reference or resource.
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Reducing the Regional Transport of Ozone (RTO) and ozone
precursors (including nitrogen oxides or NOx) is necessary to help
certain States attain the health standards for ground-level ozone
(smog). Certain States were required to revise their State Implementation
Plan (SIP) measures under EPA’s NOx SIP call to ensure that
emissions reductions are achieved to mitigate the regional transport
of ozone across State boundaries in the eastern half of the United
States. Federal Implementation Plans (FIPs) may be needed
to reduce regional transport if any State fails to adequately revise
its SIP to comply with the NOx SIP call. In accordance with section
126 of the Clean Air Act, eight Northeastern States filed petitions
requesting EPA to make findings and require decreases in NOx emissions
from certain stationary sources in upwind States that may significantly
contribute to ozone nonattainment problems in the petitioning State.
The Ozone Transport Assessment Group (OTAG) was a partnership between
the EPA, the Environmental Council of the States and various industry
and environmental groups which assessed the long-range transport
of ozone and ozone precursors.
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About RTO
NOx SIP Call
Transport FIPs
Section 126 Petitions
Links to other sites
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