use meteorological data which may be “more representative” of typical conditions compared to

the baseline design value period and (3) availability of a past modeling analysis in which the

model performed well.

Under the regional haze rule, the period for establishing baseline visibility is defined as

2000-2004. Therefore, emissions and meteorological time periods should be chosen from the

base time period. Modeling the same year (or time period) for PM2.5 NAAQS applications and

uniform rate of progress analyses is a logical way to conserve resources.

3.6 Choosing a year to project future emissions.

States/Tribes should project future emissions to the attainment year or time period, based

on the area’s classification. The “Final Rule to Implement the 8-Hour Ozone National Ambient

Air Quality Standard, Phase 1" provides a schedule for implementing emission reductions

25 The year may be the same, but the emissions may still differ. The base case inventory

may include day specific information (e.g. wildfires, CEM data) that is not appropriate for using

in future year projections. Therefore the baseline inventory may need to replace the day specific

emissions with average or “typical” emissions (for certain types of sources).


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