2.6.1. The heating air supply may be fresh or recirculated air and must be drawn from a clean area not likely to be contaminated by exhaust fumes emitted either by the propulsion engine, the combustion heater or any other vehicle source.

(9) Whereas reductions in emission limits applicable from the year 2000 corresponding to abatements of 30 % in emissions of carbon monoxide, total hydrocarbons, NOx and particulate matter have been identified by the Auto-oil programme as key measures to achieving satisfactory medium-term air quality; whereas a reduction of 30 % in exhaust smoke opacity over that measured on current engine types and complementing Council Directive 72/306/EEC(11) will contribute to the reduction of particulate matter; whereas additional reductions in emission limits applicable from 2005 of 30 % carbon monoxide, total hydrocarbons and NOx and 80 % in part ...[+++]iculates will greatly contribute to medium-term air quality benefits; whereas these reductions will take into account the effect on emissions of new test cycles that better represent the driving patterns experienced by in-service vehicles; whereas the additional NOx limit applicable from 2008 will result in a further 43 % reduction in the emission limit for this pollutant; whereas, no later than the end of 2002, the Commission is to consider the available technology with a view to confirming the mandatory NOx standard for 2008 in a report to the European Parliament and the Council, accompanied, if necessary, by appropriate proposals;

At each measuring point, the noise level of release and escape of air from the external lines coupled to the air outlet valves of compressors shall be more than 10 dB lower than the noise level of the compressor.