During motor transport operation, elevated concentrations of solid particles are formed in the air over the roadway as a result of particulate matter emissions from vehicle exhaust gases, tire and road surface wear particles, background air pollution and other processes. The content of tire and road surface wear particulates in the air over the roadway, as it has been specified in the previously submitted materials of the Russian delegation, amounts up to 60% from the total percentage of solid particles (WP-29-160-39). This paper presents further research into this subject.

Report on the deliberations of the Particle Measurement Programme informal group, including proposal for the PMP group to undertake the development of a set of recommended measurement techniques and sampling procedures, investigation of typical driving patterns, compilation and monitoring of on-going research projects, as well as networking and exchange of information with experts in the field of non-exhaust traffic related particle emissions.