tailieunhanh - Indoor and Outdoor Air Pollution Part 3

Tham khảo tài liệu 'indoor and outdoor air pollution part 3', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Air Polluted Environment and Health Effects 11 i. Some VOCs can be hazardous to health when inhaled. Benzene is a known human carcinogen and toxic. Likewise Formaldehyde is both an irritant and a sensitizer as well as being toxic ii. VOCs such as hydrocarbons constitute emissions that instigate photochemical smog. iii. Some VOCs such as methyl-tertbutyl-ether MTBE are gasoline additives that are fairly soluble in water leading to the contamination of water. iv. VOCs can form particulate matter if condensation forms of the gas Volatile Organic Compounds Polycyclic Aromatic Hydrocarbons PAH and the carbonyl compounds CO CO2 CH2O are the major organic pollutants in the atmosphere. The assessment of VOCs has become a major issue of air quality network monitoring in cities. Toluene and Benzene are the major pollutants. Table 6 gives some examples of common VOCs. VOC Hydrocarbons Other Aromatic Aliphatic Non-aromatic Unsaturated Planar Structure Cyclic Noticeable smell Saturated Tetrahedral Linear or cyclic Unsaturated Chain-like structure Non-cyclic Examples Bezene Hydrogenated products Omega-3 Formaldehyde Liquor Table 6. Volatile Organic Compound Classifications Particulate matter PM The term particulate matter PM is used to describe airborne solid particles such as dust dirt soot smoke and or liquid droplets. Classification by size is based on the aerodynamic diameter because it is a good indicator of the transport and removal of particles from the air and their deposition within the respiratory system. Based on size urban PM tends to be divided into three principal groups coarse PM10 pm -10 pm fine 1 pm - pm and ultra fine particles pm as shown in Fig. 3. Coarse PM PMio include geological materials pollen and sea salt to name a few examples. Fine PM is derived principally from emissions such as SO2 NOx and condensation of VOCs. Ultrafine PM including nanoparticles result from condensed organic carbon or sulfuric acid vapors .

TỪ KHÓA LIÊN QUAN
crossorigin="anonymous">
Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.