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UHSAS size-resolved number concentration over time from 400 to 1000 nm for singer (top). The UHSAS particle concentrations were averaged over 1 min. APS size-resolved number concentrations over time of singer (bottom) for particles in the ranges: 0.523–1, 1–2.5, 2.5–5, 5–10, and 10–20 μm. Sampling was done at the bell of the instrument.
