Effects of Weather, Time, and Pollution Level on the Amount of Particulate Matter Deposited on Leaves of Ligustrum lucidum

Table 1

The measured traffic density and environmental conditions in areas around sampling sites (— indicates not measured).

Number	Traffic density/(h^−1)	Surrounding environmental conditions
1	5170 ± 1104	Tremendous traffic density.
2	3252 ± 170	Heavy traffic density.
3	1114 ± 172	Tang Dynasty Lotus Garden, large flow of people.
4	1936 ± 265	Located in the south of Chang’an South Road, the west of Yanzhan Road, well greening environment around.
5	—	Located in Tangxing Road, good environment condition in the garden.
6	604 ± 15	Located in the cultural and educational area, small traffic density.
7	2358 ± 182	East of Northwest Water Power Building, no obvious pollution sources.
8	1688 ± 397	West of Xi’an University of Technology (Qujiang campus), east of the Science Park of Xi’an Jiaotong University, surrounded by ceramic factory, building materials warehouse.
9	764 ± 108	East of Cheng Nan Coach Station, mainly affected by auto exhaust.
10	1888 ± 334	Well greening environment around, no obvious pollution sources.
11	1442 ± 228	Adjacent to Mu Pagoda Park, well greening environment around.
12	2062 ± 649	Many buildings under construction, a lot of lime deposited on leaf surfaces, and heavy traffic density.
13	—	Next to special steel factory.
14	1612 ± 129	Located in the south of Hanguang Road, well greening environment around, no obvious pollution sources.
15	2972 ± 567	Adjacent to second ring of Southern Xi’an, affected by vehicles from second ring of southern Xi’an and Yanta North Road.
16	538 ± 70	Small traffic density, a lot of garbage piling up around, existence of the case of waste incineration.
17	2532 ± 333	Heavy traffic density, no obvious pollution sources.
18	—	Affected by chemical factory.
19	504 ± 93	Residential area, north of Xi’an Lian Chuang Electronic Group, a small range of constructions in the west.
20	1794 ± 263	Commercial district, large flow of people.
21	1556 ± 281	Medium traffic density, adjacent to wholesale base of wood, steel, and building materials.
22	1920 ± 336	Adjacent to Xi’an C. P. Pharmaceutical Co., LTD., medium traffic density.