Gas Velocity and Flow

Methods 1 & 2

Prescribes the way a duct or stack should be traversed using a pitot tube to measure velocity pressure to calculate velocity and flow rate.

Molecular Weight of Stack Gases

Method 3

Provides for the measurement of CO2 , O2 , N2 with an Orsat apparatus.

Water Vapor Content

Method 4

Utilizes a wet condensation extractive technique to quantify the amount of water vapor in a gas stream.

Particulate Matter

Method 5

Determines the concentration of filterable particles in the gas stream by an extractive, gravimetric method.

Sulfur Dioxide

Method 6

Utilizes a wet chemical, titrimetric, extractive method for SO2 concentration.

Nitrogen Oxides

Method 7E

Utilizes a continuous on-line analyzer to determine both NO and NO2 concentrations.

SO3 and Sulfuric Acid Mist

Method 8

Utilizes an extractive, titrimetric method for SO3/H2SO4.


Method 9

Relies on the observations of a trained individual to quantify plum opacity.

Particulate Matter (PM)

Method 17

Utilizes an in-stack filter to gravimetrically quantify the filterable PM at stack conditions.

Volatile Organic Compounds (VOCs)

Method 18

Utilizes a grab sample with off-line gas chromatography to characterize the VOCs in the gas stream by species.

Volatile Organic Compounds (VOCs)

Method 25A

Utilizes a continuous, on-line flame ionization detector to quantify VOCs as propane or carbon.

Condensable Particulate Matter

Method 202

An extractive method that provides for the quantification of condensable PM that is not caught on a filter. This method is generally coupled with Method 5 or 17 which provide for the filterable portion of the sample.