charge totale d'hydrocarbures

OBS: (...) hydrocarbures (HC) (...).

CONT: The introduction of the U.S. standard will reduce HC emissions from LDV's [light duty vehicles] by about 50% from the status quo level for the year 2000, and the total HC burden from the transportation sector by about 18% (from 724 kt [kilotons] to 591 kt).
OBS: ... hydrocarbons (HC) ....