# Commission Delegated Regulation (EU) 2017/654 of 19 December 2016 supplementing Regulation (EU) 2016/1628 of the European Parliament and of the Council with regard to technical and general requirements relating to emission limits and type-approval for internal combustion engines for non-road mobile machinery, Division 3.7.2: Background correction

Extent: E+W+S+N.I.

The same approach as that of point 3.6.1 shall be applied to correct the mass of PM for the background. Multiplying M – 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)]:
m PMcor = m PMuncor − M – PMbkgnd × n airdil
(7-125)
where:
m PMuncor uncorrected PM mass [g]
M – PMbkgnd mean PM concentration in dilution air [g/mol]
n airdil dilution air molar flow [mol]

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Source: https://www.legislation.gov.uk/eur/2017/654/annex/VII/division/3/division/3.7/division/3.7.2 (the official version)
Page: https://openlegislation.uk/eu-regulation-2017-654/annex-VII/division-3/division-3.7/division-3.7.2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.