advance their attainment date by at least a year27. A RACM analysis is also required for PM2.5

nonattainment areas28. Since areas are required to attain as expeditiously as practicable and

perform a RACM analysis, results of the analysis may indicate attainment can be achieved

earlier, (e.g., 2008). In this case, the timing of implementation of control measures should be

used to determine the appropriate projection year. For example, if emission reductions

(sufficient to show attainment) are implemented no later than the beginning of the 2008 ozone

season, then the attainment year and the future projection year should be no later than 2008. In

all cases, the selection of the future year(s) to model should be discussed with the appropriate

EPA Regional Office as part of the modeling protocol development process.

For regional haze assessments, the first review of progress will occur in 2018. This will

likely be based on monitored data from the 2013-2017 period. Therefore, a logical future period

to model is the middle of the five year review period (2015). But the uniform rate of progress

level can be calculated for any year in the future. Therefore, it is appropriate to model any future

year between 2015 and 2018. Unless there are reasons to the contrary, any of the years between

2015 and 2018 can be considered to be representative of the regional haze future planning

period. The calculation of the uniform rate of progress should be consistent with the emissions

projection period. For example, if a future year of 2015 is modeled, the uniform rate of progress

calculation should be based on the number of years between the base period and 2015.

Similarly, if a future year of 2018 is modeled, then the uniform rate of progress should be based

on the number of years between the base period and 2018.


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