Chemical characteristics of size-resolved PM₂.₅ at a roadside environment in Beijing, China.
Size-resolved particulate matter in the three size ranges (0.2-0.5 μm, 0.5-1.0 μm, and 1.0-2.5 μm) were collected at a roadside site in Beijing during and after the 2008 Olympic Games. The concentrations of PM mass, 14 elements, 3 major inorganic ions, and carbonaceous species were determined. The main contributors to PM(2.5) were crustal sources, vehicle emissions, secondary aerosol formation along with coal combustion, biomass from burning, and industrial processes, with vehicle emissions contributing more to roadside PM(2.5) than in the urban areas. The peaks at 0.5-1.0 μm in summer for PM mass and inorganic ions were most likely due to secondary aerosol formation, whereas the peaks at 0.2-0.5 μm in winter for PM mass and some elements were probably attributed to combustion from heating sources. The temporary control measures applied during the Olympics showed different effects on various emission sources and chemical species.
School of Environment, and State Key Joint Laboratory of Environment Simulation and Pollution Control, Tsinghua University, Beijing 100084, China.
Shaojie
S
Song
Ye
Y
Wu
Jingkun
J
Jiang
Liu
L
Yang
Yuan
Y
Cheng
Jiming
J
Hao
D000393:Air Pollutants / Q000032:analysis* / Q000737:chemistry; D000397:Air Pollution / Q000706:statistics & numerical data; D001336:Automobiles / Q000706:statistics & numerical data*; D002681:China; D002947:Cities; D004784:Environmental Monitoring; D010316:Particle Size; D052638:Particulate Matter / Q000032:analysis* / Q000737:chemistry; D012621:Seasons; D001335:Vehicle Emissions / Q000032:analysis
D000393:Air Pollutants; D052638:Particulate Matter; D001335:Vehicle Emissions