emissions rate
Allowable SO2emissions rate means the most stringent federally enforceable emissions limitation for sulfur dioxide (in lb/mmBtu) applicable to the unit or combustion source for the specified calendar year, or for such subsequent year as determined by the Administrator where such a limitation does not exist for the specified year; provided that, if a Phase I or Phase II unit is listed in the NADB, the 1985 allowable SO2 emissions rate for the Phase I or Phase II unit shall be the rate specified by the Administrator in the NADB under the data field 1985 annualized boiler SO2 emission limit.