# 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 1.4: Symbols and abbreviations for the fuel composition

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

Referred to a fuel with chemical formula CHαOεNδSγ.
Referred to a fuel with chemical formula CHαOβSγNδ.
Attention should be paid to the different meaning of symbol β in the two emissions calculation sections: in section 2 it refers to a fuel having the chemical formula CHαSγNδOε (i.e. the formula CβHαSγNδOε where β = 1, assuming one carbon atom per molecule), while in section 3 it refers to the oxygen-to-carbon ratio with CHαOβSγNδ. Then β of section 3 corresponds to ε of section 2.
Mass fraction w accompanied by the symbol of the chemical component as a subscript.
Section 2
Section 3
Quantity
w C
w C
Carbon content of fuel, mass fraction [g/g] or [% mass]
w H
w H
Hydrogen content of fuel, mass fraction [g/g] or [% mass]
w N
w N
Nitrogen content of fuel, mass fraction [g/g] or [% mass]
w O
w O
Oxygen content of fuel, mass fraction [g/g] or [% mass]
w S
w S
Sulphur content of fuel, mass fraction [g/g] or [% mass]
α
α
Atomic hydrogen-to-carbon ratio (H/C)
ε
β
Atomic oxygen-to-carbon ratio (O/C)
γ
γ
Atomic sulphur-to-carbon ratio (S/C)
δ
δ
Atomic nitrogen-to-carbon ratio (N/C)

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Source: https://www.legislation.gov.uk/eur/2017/654/annex/VII/division/1/division/1.4 (the official version)
Page: https://openlegislation.uk/eu-regulation-2017-654/annex-VII/division-1/division-1.4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.