Different processes can influence the particle size distribution of fresh automobile aerosols. Dispersion, deposition and polydisperse coagulation according to Fuchs (1964) are discussed. The monodisperse coagulation theory of Davies (1979) and the formula describing the gradient coagulation are extended to polydisperse aerosols. Also a critical review is given of the behaviour of submicron particles under the influence of the relative humidity and the reentrainment of these particles by turbulence. A survey is given of the electrical aerosol analyzer and condensation nucleus counter. The control and comparison of these instruments is treated next. After that a literature review of the particle size distributions of traffic aerosols and the emissions which can be calculated from these distributions is presented.
Abstract