As soon as


Using the technical guidance for performing the MCR, State identifies air quality

expected to be achieved at “mid-course” period (at the end of the year the MCR

is performed (e.g., 2004)




12/31/03 and


Recommended effort: States should identify analyses and data bases which will be

used to support a mid-course review and discuss these with the appropriate U.S.

EPA Regional Office.

10/1/04 EPA to provide any available assessments of national and regional control


12/31/04 State submits its MCR to EPA that determines whether sufficient progress toward

attainment is being made. Even though the MCR is not a SIP revision, EPA

recommends that the State provide an opportunity for public comment on the

MCR before submission to EPA.

3/31/05 to


If the State determines that sufficient progress is being made, the State would

continue implementing the SIP. If the State determines that progress is not being

made, the State would proceed as follows depending on the degree of progress:

a. In all cases, the State should identify the already adopted control measures for

which emission reductions phase-in after the year in which the MCR is performed

(e.g., post-2004), and potential new control measures that could form the bases

for the emission reduction inventory input for future air quality modeling if needed.

b. EPA recommends that the State implement some or all of the short-term

corrections identified in its MCR to expedite getting the area back on course

toward attainment.

c. If the problem is more severe and not readily addressed by short-term

corrections, EPA recommends that the State voluntarily and expeditiously begin

the process to revise its SIP, including new modeling as appropriate.

EPA will also review the MCR. If EPA determines that sufficient improvement in

ozone air quality is not occurring within the State, and that the State is not

implementing sufficient corrective measures to address its contribution to that lack

of progress, EPA would either find that the State has failed to implement a part of

its SIP and/or issue a call for SIP revision for the State. Also, if EPA determines

that sufficient progress is not being made by any upwind State that had previously

been found to contribute significantly to the State’s ozone problem, EPA would

concurrently either find that an upwind State has failed to implement a part of its

SIP and/or issue a call for a SIP revision from such an upwind State. (Likely

timeframes for proposed and final rule on call for SIP revision: 4/30/05 and

8/31/05.) See section B below regarding transport.

The EPA would specify the time period for a State to act; that time would be no

longer than 18 months from the determination of lack of progress or call for SIP

revision (e.g., 2/28/07). Actions the State may need to take are--

–any corrective action identified in the MCR

–submitting a new attainment demonstration with new modeling based on a new

base year emission inventory and appropriate meteorological episodes.


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