The following equation can be used to correct a measured pollutant concentration in an emitted gas (containing a measured CO content) to an equivalent pollutant concentration in an emitted gas containing a specified reference amount of CO:
Thus, a measured particulates concentration of 0.1 grain per dscf in a gas that has 8 volume % CO is<br>
0.1 × ( 12 ÷ 8 ) = 0.15 grain per dscf when corrected to a gas having a specified reference CO content of 12 volume %.
Notes:
* Although ppmv and grains per dscf have been used in the above examples, concentrations such as ppbv (i.e., parts per billion by volume), volume percent, grams per dscm and many others may also be used.
* 1 percent by volume = 10,000 ppmv (i.e., parts per million by volume).
* Care must be taken with the concentrations expressed as ppbv to differentiate between the British billion which is 10 and the USA billion which is 10.