Abstract
Polycyclic aromatic hydrocarbons (PAHs) are incomplete combustion products that are widely distributed in the atmosphere. Several PAHs are considered carcinogenic and adsorb to particles in the air. Particulate matter with a diameter of 2.5 μm or less (PM2.5 or Fine Particles) can transport and embed adsorbed PAHs deep into the respiratory system. This research analyzed the presence of 16 common PAHs adsorbed to PM2.5 in the Syracuse, NY area at three sites varying in distance from a major highway. While fine particle concentrations did not increase substantially with highway proximity, adsorbed PAH concentrations were two times higher at the highway site than the rural site. Fine particle concentrations were strongly dependent on long-range transport from an industrial region to the southwest. During warmer periods, observed re-volatilization of deposited PAHs competes with dominant mobile combustion inputs. This research implies a complex pattern of exposure driven by local and regional sources.