Formation of urban fine particulate matter.
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Urban air pollution represents one of the greatest environmental challenges facing mankind in the 21st century. Noticeably, many developing countries, such as China and India, have experienced severe air pollution because of their fast-developing economy and urbanization. Urban fine PM has been unequivocally associated with adverse human health impacts. The human health effects of fine PM range from aggravating allergies to the development of serious chronic diseases and premature death. Fresh SOC consistently exhibits a brown color in Los Angeles, indicating the presence of absorbing organic aerosols. Radiocarbon measurements of filter samples reveal that SOA is mainly from fossil fuel burning. The surface convergence and thermally driven flows decrease the probability of multiday accumulation for pollutants. A higher number concentration of smaller particles exists during the clean period, and a slightly lower particle number concentration of larger particles exists during the polluted period.
author list (cited authors)
Zhang, R., Wang, G., Guo, S., Zamora, M. L., Ying, Q. i., Lin, Y., ... Wang, Y.