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- W2046415299 abstract "Suspended particles with a diameter below 1 μm act as vehicles transporting toxic chemicals into the human respiratory system. It is therefore of interest to record the intensity of these particles and to determine the source from which they were emitted. It is shown that this can be done by simultaneously measuring the light scattering (LS), the photoelectric charging (PC), and the diffusion charging (DC). Particles carrying polycyclic aromatic hydrocarbons (PPAH) are detected by their large PC and are generated in combustion of organic materials, whereas particles from other sources only exhibit LS and DC. With combustion-generated particles, the ratio of PC/DC allows to determine the type of combustion from which the particles were emitted. In particular, particles from diesel emission can be distinguished from cigarette smoke. It is further demonstrated how changes of chemical composition or of particle size that might occur in the atmosphere are detectable. As an example of an application, we studied the nanoscale particles found on motorways in the industrialized world. The sources of the majority of these particles are diesel motors. The fraction of particle mass due to PPAH is independent of location and weather conditions. However, the particle concentration is much larger in Tokyo and in Paris than in Zurich due to the higher density of diesel vehicles." @default.
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- W2046415299 date "1998-01-01" @default.
- W2046415299 modified "2023-09-28" @default.
- W2046415299 title "Physical and chemical properties of airborne nanoscale particles and how to measure the impact on human health" @default.
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- W2046415299 doi "https://doi.org/10.1016/s0166-1280(98)00361-3" @default.
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