Where:
E30 = 30 operating day average emissions rate of NOX, lb NOX/ton of 100 percent HNO3;
Ci = concentration of NOX for hour i, ppmv;
Qi = volumetric flow rate of effluent gas for hour i, where Ci and Qi are on the same basis (either wet or dry), scf/hr;
Pi = total acid produced during production hour i, tons 100 percent HNO3;
k = conversion factor, 1.194 * 10-7 for NOX; and
n = number of operating hours in the 30 operating day period, i.e., n is between 30 and 720.
40 C.F.R. §60.75a