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INTRODUCTIONIn the past different authors e.g. Bigg, Weber et al., [1, 8] reported the sporadic, i.e. temporary and locally restricted, occurrence of high number concentrations of ultra-fine aerosol particles d p < 20 nm in the atmosphere. These observations are explained by the sporadic formation of new particles from gaseous precursors, i.e. homogeneous nucleation processes. Such sporadic...
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