title: Seasonal change in the atmospheric concentration of particulate polycyclic aromatic hydrocarbons in Ho Chi Minh City, Vietnam.
abstract: We analyzed atmospheric particulate polycyclic aromatic hydrocarbons (PAHs) in Ho Chi Minh City, Vietnam, for 19 months. The average concentrations of total PAHs at dry and rainy seasons were 4.28 +/- 2.83 and 15.71 +/- 8.21 ng m(-3), respectively. The use of motorcycles without catalytic converters, estimated to be main emission sources of PAHs, would be higher during the dry season. PAH concentrations show a negative correlation with sunshine duration (r = -0.51). Furthermore, the ratio of average PAH concentration in the dry season to that in the rainy season shows a positive correlation with photolytic half-life (r = 0.94). Thus, seasonal changes in PAH concentrations are attributable to their photolytic degradation.
authors.affiliation: Research Institute for Environment, Agriculture, and Fisheries, Osaka Prefectural Government, Osaka 537-0025, Japan. kishida82477@iris.eonet.ne.jp
authors.forename: Masao
authors.initials: M
authors.lastname: Kishida
authors.forename: Chihiro
authors.initials: C
authors.lastname: Mio
authors.forename: Keiichi
authors.initials: K
authors.lastname: Fujimori
authors.forename: Kiyoshi
authors.initials: K
authors.lastname: Imamura
authors.forename: Norimichi
authors.initials: N
authors.lastname: Takenaka
authors.forename: Yasuaki
authors.initials: Y
authors.lastname: Maeda
authors.forename: Tran Thi Ngoc
authors.initials: TT
authors.lastname: Lan
authors.forename: Yasuhiko
authors.initials: Y
authors.lastname: Shibutani
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Bandow
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D011083:Polycyclic Compounds / Q000032:analysis*; D012621:Seasons; D014744:Vietnam
chemical_list: D000393:Air Pollutants; D011083:Polycyclic Compounds