TAILIEUCHUNG - Báo cáo "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 industrialization in Vietnam have brought about high air pollutant emissions including the O3 precursors. Ground level O3 may already be high in large cities like Hanoi and Ho Chi Minh City. The O3 episode is very important for scene of view of photochemical smog in Hanoi. Ozone episodes are selected on the days which have a. | VNU Journal of Science Earth Sciences 24 2008 169-175 Photochemical smog introduction and episode selection for the ground-level ozone in Hanoi Vietnam Dam Duy An1 Hoang Xuan Co1 Nguyen Thi Kim Oanh2 1 College of Science VNU 2 Asian Institute of Technology Thailand Received 18 September 2008 received in revised form 20 December 2008. Abstract. 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 O3 precursors. Ground level O3 may already be high in large cities like Hanoi and Ho Chi Minh City. The O3 episode 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 days time. 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. Keywords Photochemical smog Ozone Volatile organic compounds Secondary pollutant. 1. Introduction Photochemical smog occurs in the troposphere the lower portion of our atmosphere. Ground-level ozone the primary component of photochemical smog is the most prevalent pollutant that has been known to cause a serious air pollution problem in many developed countries over the past few decades. In this paper only ground-level ozone is considered as a pollutant. Ozone O3 is a secondary pollutant formed in the atmosphere through a complex non-linear chemical reaction involving two classes of precursors reactive volatile organic compounds VOCs and oxides of nitrogen NOx in the

• Báo cáo khoa học
• Photochemical
• earth sciences
• Research
• VNU Journal of Science
• scientific research
• scientific reports
• Antimicrobial and photochemical
• Calotropis gigantea leaf extracts
• UV light radiation
• Anti microbial activity
• Aerial part of Calotropis gigantea
• Journal of Chemistry
• Zinc phthalocyanine
• Octa substituted
• Halogen substitution
• Comparative photochemical
• Photophysical features
• Metallo phthalocyanines
• Cyclic voltammetry
• Computational chemistry
• Photodynamic therapy
• Photochemical properties
• Azo dye
• Metallophthalocyanines (MPcs)
• Photodynamic therapy (PDT)
• Photochemical reaction
• Photopolymer
• Photocrosslinking
• Photodegradation
• photopolymerization
• Direct Photoinitiator
• Decolorisation
• Textile Dyeing Effluents
• Azo Dyes
• Wastewater Treatment
• Photochemical Treatments
• Pilot Plant Experiences
• Oxidation Processes
• Cooling Systems Design
• Greenhouse Environment
• Hypersonic Aerodynamics
• Industrial Applications
• Agricultural
• Biological Sciences
• genistein
• isoflavones content
• soybean producers
• báo cáo khoa học
• báo cáo hóa học
• công trình nghiên cứu về hóa học
• tài liệu về hóa học
• cách trình bày báo cáo
• Báo cáo lâm nghiệp hay
• báo cáo lâm nghiệp
• công trình nghiên cứu lâm nghiệp
• tài liệu về lâm nghiệp
• Molecular Spectroscopy
• Magnetic Resonance
• Quantum Chemistry
• Photochemical Dynamics
• Gas Phase Kinetics
• Chiral Oxirans
• Miscellaneous Syntheses
• Miscellaneous reactions
• nitrogen nucleophiles
• Thermal and Photochemical
• Organometallic Compounds
• Report medicine
• traditional medicine
• intermediate cells
• cell proliferation
• medical analysis
• oxidation
• chemical reaction
• tumor cells
• Tạp chí khoa học
• Khoa học tự nhiên
• Chemical technology
• Polyacrylonitrile membrane
• Surface modification
• The management of quality
• Diffusional kinetics
• Environmental combustion considerations
• Diffusion flames
• Combustion of nonvolatile fuels
• The nature of photochemical smog
• The atmosphere
• Environmental chemistry
• Gas phase reactions
• Photochemical ozone
• Acid deposition
• Deposition mechanisms
• Antioxidative response
• Carthamus tinctorius L
• Photochemical activity
• Salt stress
• Biochemical parameters
• Crop species
• Textile azo dyes
• Textile dye
• Synthetic origins of dyes
• Photosynthetic performance indexes
• Wheat increased
• Textile dye treatments
• Ascorbate peroxidase
• Chlorophyll fluorescence kinetics
• Drought tolerance
• Phaseolus vulgaris
• Lipid peroxidation
• Nano TiO2 photocatalyst
• UV H2O2 oxidation
• Explosives production facilities
• Various photochemical systems
• UV light
• BMC Plant Biology
• Non photochemical quenching
• 22 kDa Photosystem
• Hydrogen peroxide
• Reactive oxygen species
• Plant Biology
• Karyotype analysis
• Chlorophyll fluorescence
• Hippeastrum rutilum