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.
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We thank the staff of the General Statistics Office, Government of Vietnam, for providing meteorological data for HCMC. We also thank Dr. T. Kameda, Kanazawa University, for offering useful advice.
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Kishida, M., Mio, C., Fujimori, K. et al. Seasonal Change in the Atmospheric Concentration of Particulate Polycyclic Aromatic Hydrocarbons in Ho Chi Minh City, Vietnam. Bull Environ Contam Toxicol 83, 747–751 (2009). https://doi.org/10.1007/s00128-009-9779-4
- Ho Chi Minh City
- Particulate PAHs
- Dry season
- Photolytic degradation