# Commission Regulation (EU) 2017/1151 of 1 June 2017 supplementing Regulation (EC) No 715/2007 of the European Parliament and of the Council on type-approval of motor vehicles with respect to emissions from light passenger and commercial vehicles (Euro 5 and Euro 6) and on access to vehicle repair and maintenance information, amending Directive 2007/46/EC of the European Parliament and of the Council, Commission Regulation (EC) No 692/2008 and Commission Regulation (EU) No 1230/2012 and repealing Commission Regulation (EC) No 692/2008 (Text with EEA relevance), Division 6.1.2: The following pure gases shall be available, if necessary, for calibration and operation:


6.1.2.1.Nitrogen:
Purity: ≤ 1 ppm C1, ≤ 1 ppm CO, ≤ 400 ppm CO2, ≤ 0,1 ppm NO, ≤ 0,1 ppm N2O, ≤ 0,1 ppm NH3;
6.1.2.2.Synthetic air:
Purity: ≤ 1 ppm C1, ≤ 1 ppm CO, ≤ 400 ppm CO2, ≤ 0,1 ppm NO, ≤ 0,1 ppm NO2; oxygen content between 18 and 21 per cent volume;
6.1.2.3.Oxygen:
Purity: > 99,5 per cent vol. O2;
6.1.2.4.Hydrogen (and mixture containing helium or nitrogen):
Purity: ≤ 1 ppm C1, ≤ 400 ppm CO2; hydrogen content between 39 and 41 per cent volume;
6.1.2.5.Carbon monoxide:
Minimum purity 99,5 per cent;
6.1.2.6.Propane:
Minimum purity 99,5 per cent.

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Source: https://www.legislation.gov.uk/eur/2017/1151/annex/Sub/5/division/division/6./division/6.1./division/6.1.2. (the official version)
Page: https://openlegislation.uk/eu-regulation-2017-1151/annex-Sub/5/division/division-6./division-6.1./division-6.1.2.
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.