# 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 1.3: Symbols and abbreviations for the chemical components (used also as a subscript)

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

Section 2
Section 3
Quantity
Ar
Ar
Argon
C1
C1
Carbon 1 equivalent hydrocarbon
CH4
CH4
Methane
C2H6
C2H6
Ethane
C3H8
C3H8
Propane
CO
CO
Carbon monoxide
CO2
CO2
Carbon dioxide
H
Atomic hydrogen
H2
Molecular hydrogen
HC
HC
Hydrocarbon
H2O
H2O
Water
He
Helium
N
Atomic nitrogen
N2
Molecular nitrogen
NOx
NOx
Oxides of nitrogen
NO
NO
Nitric oxide
NO2
NO2
Nitrogen dioxide
O
Atomic oxygen
PM
PM
Particulate matter
S
S
Sulphur

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Source: https://www.legislation.gov.uk/eur/2017/654/annex/VII/division/1/division/1.3 (the official version)
Page: https://openlegislation.uk/eu-regulation-2017-654/annex-VII/division-1/division-1.3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.