Sources, Distribution and Toxicity of Polyaromatic Hydrocarbons (PAHs) in Particulate Matter

摘要: Polycyclic aromatic hydrocarbons (PAHs) are a group of organic compounds consisting two or more fused rings. PAHs originate mainly from anthropogenic processes, particularly incomplete combustion fuels. distributed widely in the atmosphere. Natural such as volcanic eruptions and forest fires, also contribute to an ambient existence PAHs. can be present both particulate gaseous phases, depending upon their volatility. Light molecular weight (LMW PAHs) that have three rings emitted phase, while high (HMW PAHs), with five rings, phase. In atmosphere, undergo photo-degradation react other pollutants, sulfur dioxide, nitrogen oxides, ozone. Due widespread sources persistent characteristics, disperse through atmospheric transport exist almost everywhere. Human beings exposed PAH mixtures phases air. Long-term exposure concentrations is associated adverse health problems. Since some considered carcinogens, inhalation particulates potentially serious risk linked excess lung cancer. Thus, studies on matter (PM), PM10 PM2.5 air, become attention greater focus research recent years.