Photochemical smog introduction and episode selection for the ground-level ozone in Hanoi, Vietnam
Ozone (O3) is a secondary pollutant formed in the atmosphere throughout a complex non-linear chemical reaction involving two classes of precursors: the reactive volatile organic compounds (VOCs) and the oxides of nitrogen (NOx) in the presence of sunlight. The rapid urbanization and industrial...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
VNU
2014
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| Subjects: | |
| Online Access: | http://repository.vnu.edu.vn/handle/11126/4587 |
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| Institution: | Vietnam National University, Hanoi |
| Language: | English |
| Summary: | Ozone (O3) is a secondary pollutant formed in the atmosphere throughout a complex
non-linear chemical reaction involving two classes of precursors: the reactive volatile organic
compounds (VOCs) and the oxides of nitrogen (NOx) in the presence of sunlight.
The rapid urbanization and industrialization in Vietnam have brought about high air pollutant
emissions including the O3precursors. Ground level O3may already be high in large cities like
Hanoi and Ho Chi Minh City. The O3episode is very important for scene of view of
photochemical smog in Hanoi. Ozone episodes are selected on the days which have a high
concentration that lasts for at least two daystime. During the episode selection, ozone
concentrations larger than 46ppb were observed at two stations (the Lang and Lac Long Quan
stations) in March. The maximum value of 74ppb was measured at the Lang station at 14:00 on
March 3. This episode was observed in a common meteorological condition for this time of the year. |
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