Seasonal change in the atmospheric concentration of particulate polycyclic aromatic hydrocarbons in Ho Chi Minh City, Vietnam.
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.
Kishida
Masao
M
Research Institute for Environment, Agriculture, and Fisheries, Osaka Prefectural Government, Osaka 537-0025, Japan. kishida82477@iris.eonet.ne.jp
Mio
Chihiro
C
Fujimori
Keiichi
K
Imamura
Kiyoshi
K
Takenaka
Norimichi
N
Maeda
Yasuaki
Y
Lan
Tran Thi Ngoc
TT
Shibutani
Yasuhiko
Y
Bandow
Hiroshi
H
D000393:Air Pollutants / Q000032:analysis*; D011083:Polycyclic Compounds / Q000032:analysis*; D012621:Seasons; D014744:Vietnam
D000393:Air Pollutants; D011083:Polycyclic Compounds