Division 3.7.2 Background correction

The same approach as that of point 3.6.1 shall be applied to correct the mass of PM for the background. Multiplying ${\bar{M}}_{\mathrm{PMbkgnd}}$ by the total flow of dilution air, the total background mass of PM (m _PMbkgnd [g]) is obtained. Subtraction of total background mass from total mass gives background corrected mass of particulates m _PMcor [g] [equation (7-125)]:

where:

m _PMuncor

uncorrected PM mass [g]

${\bar{M}}_{\mathrm{PMbkgnd}}$

mean PM concentration in dilution air [g/mol]

n _airdil

dilution air molar flow [mol]