Study of particle number size distributions at Azadi terminal in Tehran, comparing high-traffic and no traffic area.

摘要: Vehicle traffic is known as the anthropogenic aerosol source in megacities. Exposure to ambient air pollution, especially particulate matter has become most environmental risk factor. The main aim of this study determine particle number and their size distribution Tehran at Azadi terminal (located West Tehran), crossing Nawab streets area with high traffic, campus University an without traffic. Particle (0.3-1 μm) was measured using a Grimm Environmental Dust Monitor conducted two seasons, hot cold (summer 2016 winter 2016). measurement performed twice per month. Although average particles Terminal more than other locations both seasons but it not significant) p > 0.05). larger 0.3 μm 286.72 ± 129.55 183.61 ± 86.79 cm-3 summer respectively. In relation distribution, 0.4, 0.5, 0.65, 0.8 1 μm were 111.5 ± 120, 29.3 ± 23.7, 8.2 ± 5.8, 4 ± 3, 2 ± 1.5 52.5 ± 37, 14.4 ± 10.8, 6.1 ± 5, 3.8 ± 3.5, 2.3 ± 2 cm-3 current highest significantly observed time comparison summer. addition, had no significant difference between three sampling locations.