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Pb Isotopes as an Indicator of the Asian Contribution to Particulate Air Pollution in Urban California

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Department of Earth and Planetary Science, University of California, Berkeley, Earth Sciences Division, Lawrence Berkeley National Laboratory, Research Division, California Air Resources Board, Sacramento, California, and Department of Applied Science, University of California, Davis
*Corresponding author e-mail: [email protected]
†University of California Berkeley.
‡Lawrence Berkeley National Laboratory.
§California Air Resources Board.
∥University of California, Davis.
⊥Current address: Department of Land Resources and Environmental Sciences, Montana State University.
Cite this: Environ. Sci. Technol. 2010, 44, 23, 8911–8916
Publication Date (Web):October 29, 2010
https://doi.org/10.1021/es101450t
Copyright © 2010 American Chemical Society
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Abstract

During the last two decades, expanding industrial activity in east Asia has led to increased production of airborne pollutants that can be transported to North America. Previous efforts to detect this trans-Pacific pollution have relied upon remote sensing and remote sample locations. We tested whether Pb isotope ratios in airborne particles can be used to directly evaluate the Asian contribution to airborne particles of anthropogenic origin in western North America, using a time series of samples from a pair of sites upwind and downwind of the San Francisco Bay Area. Our results for airborne Pb at these sites indicate a median value of 29% Asian origin, based on mixing relations between distinct regional sample groups. This trans-Pacific Pb is present in small quantities but serves as a tracer for airborne particles within the growing Asian industrial plume. We then applied this analysis to archived samples from urban sites in central California. Taken together, our results suggest that the analysis of Pb isotopes can reveal the distribution of airborne particles affected by Asian industrial pollution at urban sites in northern California. Under suitable circumstances, this analysis can improve understanding of the global transport of pollution, independent of transport models.

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