7.

DETERMINATION OF THE QUANTITY OF GASEOUS POLLUTANTS EMITTED 7.1. Correction of the measured volumes of gas The volume of the gases contained in each bag shall be referred to normal temperature and pressure by means of the formula: >PIC FILE= "T0002127"> Vm : is the volume, expressed in litres, recorded as indicated in item 6.3.5; tm : is the arithmetic mean of the extreme temperatures recorded as indicated in item 6.3.3, expressed in degrees Celsius; Pm : is the arithmetic mean of the extreme absolute pressures recorded as indicated in item 6.3.4, expressed in millimetres of mercury ; and PH : is the saturated-water-vapour pressure, expressed in millimetres of mercury, at temperature Tm. 7.2. Mass of the gaseous pollutants contained in each bag The mass of the gaseous pollutants contained in each bag shall be determined by the product dCV, where C is the content by volume and d the volume mass of the gaseous pollutant considered : - in the case of carbon monoxide, d = 1 7 250; in the case of hydrocarbons, d = 3 7 844 (n-hexane). 7.3. Total mass of gaseous pollutants emitted The mass M of each gaseous pollutant emitted by the vehicle during the test shall be determined by adding the masses of the gaseous pollutants contained in each bag and calculated as indcated in item 7.2. Note : Laboratories are recommended to check the analyses by also measuring the quantity of carbon dioxide produced. APPENDIX 1 >PIC FILE= "T0002128"> APPENDIX 2 Analysis of the operating cycle used for the type I test >PIC FILE= "T0002129"> Average speed during test : 19 km/h. Effective running time : 195 sec. Theoretical distance covered per cycle : 1 7 013 km. Equivalent distance for the test (4 cycles) : 4 7 052 km.

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Source: EUR-Lex (Cellar) · retrieved 2026-11-01 · Text as adopted (Official Journal); later amendments are not incorporated in this text.