Vehicle Traffic as a Source of Particulate Polycyclic Aromatic Hydrocarbon Exposure in the Mexico City Metropolitan Area

Linsey C.Marr; Lisa A.Grogan; Henry WorhrnschimmelLuisa T.MolinaMario J.MolinaThomas J.SmithEric Garshick

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Vehicle Traffic as a Source of Particulate Polycyclic Aromatic Hydrocarbon Exposure in the Mexico City Metropolitan Area

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Surface properties of aerosols in the Mexico City metropolitan area have been measured in a variety of exposure scenarios related to vehicle emissions in 2002,using continuous,real-time instruments.The objective of these experiments is to describe ambient and occupational particulate polycyclic aromatic hydrocarbon (PAH) concentrations associated with vehicular traffic and facilities using diesel vehicles.Median total particulate PAH concentrations along Mexico City's roadways range from 60 to 910 ng m~(-3),averaged over a minimum of 1 h.These levels are approximately 5timeshigherthan concentrations measured in the United States and among the highest measured ambient values reported in the literature.The ratio of particulate PAH concentration to aerosol active surface area is much higher along roadways and in other areas of fresh vehicle emissions,compared to ratios measured at sites influenced more by aged emissions or noncombustion sources.For particles freshly emitted by vehicles,PAH and elemental carbon (EC) concentrations are correlated because they both originate during the combustion process.Comparison of PAH versus EC and active surface area concentrations at different locations suggests that surface PAH concentrations may diminish with particle aging.These results indicate that exposure to vehicle-related PAH emissions on Mexico City's roadways may present an important public health risk.

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《Environmental Science & Technology: ES&T》 |2004年第9期|2584-2592|共9页
作者
Linsey C.Marr; Lisa A.Grogan; Henry WorhrnschimmelLuisa T.MolinaMario J.MolinaThomas J.SmithEric Garshick;
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作者单位

Department of Earth,Atmospheric,and Planetary Sciences,Massachusetts Institute of Technology,Cambridge,Massachusetts 02139;

Department of Environmental Health,Harvard School of Public Health,Boston,Massachusetts 02115;

Pulmonary and Critical Care Medicine Section,VA Boston Healthcare System,Boston,Massachusetts 02132,and Channing Laboratory,Department of Medicine,Brigham and Women's Hospital,Harvard Medical School,Boston,Massachusetts 02115;

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正文语种英语
中图分类环境化学;
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Vehicle Traffic as a Source of Particulate Polycyclic Aromatic Hydrocarbon Exposure in the Mexico City Metropolitan Area

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