Analysis On The PAHs Sources And Relevant Of Airborn Particulate Matter (PM₁₀ And PM_2.5) In Nanchang

Atmospherical aerosols is one of the most important and harmful atmospherical pollutions in urban air of Nanchang. It has seriously adverse effects on respiratory system and cardiovascular system, as well as eyes and naked skin of human. Hydrocarbon organic compounds are the most important chemical contents in Atmospherical Particles. Many of them are carcinogenic, teratogenic and mutagenic. Polycyclic Aromatic Hydrocarbons (PAHs), a kind of POPs are ubiquitous in air, contributing more than 1/3 of the total carcinogenic chemicals. The PAHs in urban atmospherical particulate are complex, widely distributed and most closely related to human health, Moreover the concentration of PAHs in urban atmospherical particulate is relative high. So an accurate grasp of the occurrence and situation of the PAHs on fine particulate matter can provide a scientific basisis to controll PAHs pollution, reduce personal intake and improve human health efficiently.The research focused on the atmospheric particles of different functional aeras and different seasons in Nanchang. PM10 and PM2.5 were synchronous sampled in Jul-Aug 2008 and Nov-Dec 2008, and PAHs of PM10 and PM2.5 were comparatively analyzed to investigate the distribution characteristics and the rules of space-time changes.According to above analysis, The daily average concentration of PM10 and PM2.5 is respectively 193.07μg/m3 and 122.83μg/m3 in summer. The daily average concentration of PM10 and PM2.5 was respectively 213.95μg/m3 and 164.37μg/m3 in winter. The daily average concentration of PM10 and PM2.5 in summer were lower than that in winter. In the different aeras the pollution severity order of PM10 was Bayi Square (traffic roads), Luojiaji distirict (industrial zone), Qianhu Campus of Nanchang Univrsity (suburban), North Campus of Nanchang Univrsity (commercial mixing zone). And the order of PM2.5 was Bayi Square, Luojiaji distirict, North Campus of Nanchang Univrsity. The amount of PM2.5 was remarkably linear correlated with the amount of PM10. Atmospheric fine particulates (PM2.5) accounted for 68.5% of PM10. The severity order of PAHs pollution in PM10 and PM205 was traffic roads (worse than), industrial zone, commercial mixing zone, suburban. The toxic risk was Bayi Square, Luojiaji distiric, North Campus of Nanchang Univrsity, Qianhu Campus of Nanchang Univrsity. The main pollution sources were vehicle emission, high-temperature combustion and coal combustion in the four functional aeras of Nanchang. The result of factor analysis confirmed to energy structure of Nanchang city.