This Document specifies methods, apparatus, and calculations whichare used in conjunction with Performance Test Codes to determinequantitatively, the gaseous constituents of exhausts resulting fromstationary combustion sources. The gases covered by this Documentare oxygen, carbon dioxide, carbon monoxide, nitrogen, sulfurdioxide, sulfur trioxide, nitric oxide, nitrogen dioxide, hydrogensulfide, and hydrocarbons. Stationary combustion sources includesteam generators, gas turbines, internal combustion engines,incinerators, etc. Included are instrumental methods as wellas (normally, wet chemical) methods. The instrumental methodsinclude instruments used for non-continuous or continuous samplingusing extractive samples and in-situ type instruments that requireno sampling system.