Comparison of polycyclic aromatic hydrocarbon pollution in Chinese and Japanese residential air

Comparative studies on polycyclic aromatic hydrocarbon (PAH) pollution in residential air of Hangzhou (China) and Shizuoka (Japan) were conducted in summer (August,2006) and winter (January,2007).Total concentrations of 8 PAHs ranged from 7.1 to 320 ng/m 3 and 0.15 to 35 ng/m 3 in residential air of Hangzhou and Shizuoka,respectively.Air PAH concentrations in smoking houses were higher than that in nonsmoking houses.In nonsmoking houses,mothball emission and cooking practice were the emission sources of 2and 3-ring PAHs in Hangzhou,respectively.The 2and 3-ring PAHs were from use of insect repellent,kerosene heating and outdoor environment in nonsmoking houses in Shizuoka.The 5and 6-ring PAHs in residential air were mainly from outdoor environment in both cities.Toxicity potencies of PAHs in residential air of Hangzhou were much higher than that in Shizuoka.