“…PAHs are products of incomplete combustion and pyrolysis of fossil fuels such as petroleum and coal and other organic materials from natural and anthropogenic sources [3][4][5][6][7][8][9][10][11][12][13] including fossil fuels combustion [14], vehicle exhaust [15,16], open-fire straw burning [16,17], cigarette smoking [17], wood combustion [18], industrial production [19], including waste incineration [6], metal production [20], coke production [20], iron production [5,17], airplane production [17], etc. Results of previous studies had shown that the main sources of PAHs in urban area were traffic exhaust (diesel or gasoline) and certain industrial processes [20,21].…”