To determine the HC+NOx level for the base year, HC_base and NOx_base are added. HC and NOx are both changed to their final year level in equal increments. To calculate the HC+NOx standard for a given model year and rated power, use Table 2 and the following equation:

　

　

HC+NOx = emission standard in a given model year in g/kw-hr

A = hydrocarbon reduction factor based in a given model year.

B = NOx level factor in a given model year

C = maximum HC+NOx average, in g/kw-hr, in a given model year

　

Table 2

OB/PWC Engine

Factors for Calculation of HC+NOx Emission Standard

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