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Changes in fluorescent particle concentrations at a 2-m high above the ground at the sampling site of Tsogt-Ovoo City for March 16–18 in 2014 (UTC) (a), March 7–11 in 2015 (UTC) (b), and April 26–27 in 2015 (UTC) (c). The error bars were obtained from the count numbers obtained from the ten fields of microscopic observation
