The air pollution characteristics during the 2013 Lanzhou International Marathon were investigated by measuring particles concentrations in the size range 10 to 600 nm using a TSI particle sizer from 1 to 30 June, 2013 in urban Lanzhou. The particle number concentrations in size ranges 50~100 nm, 100~200 nm and 200~500 nm on traffic-restricted day were significantly lower than those on normal Saturday during the temporary traffic control period with comparable meteorological conditions (11:00 (Beijing Time, hereafter the same)14:00), especially fine particles with diameters ranging from 50 to 200 nm. For the period with similar meteorological conditions (11:00-14:00), the mean particle number concentrations in the size ranges 50~100 nm and 100~200 nm were 2567.5±807.4 cm-3 and 1567.8±193.8 cm-3, respectively, on 15 June (traffic-restricted day), which is 60.2% and 67.2% lower than those on 22 June (normal saturday). The impacts of traffic restriction on particle number concentration mainly concentrated on accumulation modes with peak in 107 nm. Meteorological conditions had significant influence on particle number concentration in the size range 10~300 nm with a larger effect in 80 nm.
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