de minimis Levels
de minimis Levels : de minimus levels are levels and vary according to the type of pollutant and severity of the non-attainment area. These levels are consistent for all conformity determinations (unless the State chooses to set lower de minimis levels and apply the conformity requirements to non-federal as well as Federal entities). The calculation of total project emissions is made and the difference before the Proposed Project emissions and the No Action emissions are compared to these de minimis cutoffs. If the emissions for a pollutant are above de minimis, the project requires a conformity determination. All emissions from the project must be analyzed and found to conform, not only those above the de minimis levels
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