§ 51.1008 Emissions inventory requirements.
(a) For any nonattainment area initially classified as Moderate, the state shall submit to the EPA all of the following:
(1) A base year inventory for the nonattainment area for all emissions sources that meets the following minimum criteria:
(i) The inventory year shall be one of the 3 years for which monitored data were used for designations or another technically appropriate inventory year if justified by the state in the plan submission.
(ii) The inventory shall include actual emissions of all sources within the nonattainment area.
(iii) The emissions values shall be either annual total emissions, average-season-day emissions, or both, as appropriate for the relevant PM2.5 NAAQS. The state shall include as part of the plan a rationale for providing annual or seasonal emissions, and the justification for the period used for any seasonal emissions calculations.
(iv) The inventory shall include direct PM2.5 emissions, separately reported PM2.5 filterable and condensable emissions, and emissions of the scientific PM2.5 precursors, including precursors that are not PM2.5 plan precursors pursuant to a precursor demonstration under § 51.1006.