Abstract
Airborne particulate matter (PM) includes both organic and inorganic components and is formed from a variety of sources, including combustion, dust, and particle formation from oxidation of precursor gases. Epidemiological studies have shown adverse health effects of PM including respiratory irritation and changes in pulmonary function as well as associations between PM mass concentrations and mortality [1]. Some studies have also shown that ultrafine particles (less than 100 nm diameter) are likely to cause adverse health effects [2-4]. In addition to affecting human health, fine particulate matter impacts climate and visibility. Because of these effects, sources of fine PM and secondary PM precursors are increasingly regulated. A good understanding of emission sources and atmospheric processes that govern fine PM concentrations and size distributions is critical to the design of effective control policies.
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