大气污染控制Lecture 2 Air pollution Effects.ppt

Air Pollution Answer Threshold Lecture 2 Air Pollution Effects Ⅰ Effects on Human Health Ⅰ Effects on Human Health Ⅰ Effects on Human Health Ⅰ Effects on Human Health Ⅰ Effects on Human Health Ⅰ Effects on Human Health Ⅰ Effects on Human Health Ⅰ Effects on Human Health Ⅱ Effects on Properties Ⅱ Effects on Properties Ⅱ Effects on Properties Ⅲ Effects on Visibility Ⅲ Effects on Visibility Ⅲ Effects on Visibility Ⅳ Effects on Global Warming Green house effect Green house effect Green house effect Greenhouse Gases Emission Greenhouse  Gases Emission Impacts of Global Warming Ⅴ Effects on Stratospheric Ozone Depletion Ozone Reaction What Is The Ozone Hole? The Halley Research Station How Ozone Holes are Formed? The Ozone Hole Monthly Ozone Averages for October  How Ozone Holes are Formed? How Ozone Holes are Formed? Ozone-destroying chemicals How CFCs destroyed Stratospheric zone? Harmful Impacts of Ozone Holes DISCUSSION Ozone-destroying chemicals Name Use When U. S. production ends* CFCs(chlorofluorocarbons) solvents, aerosol sprays (most spray can uses banned in 1970s) foaming agents in plastic manufacture January 1, 1996 Halons fire extinguishers January 1, 1994 Carbontetrachloride solvents, chemical manufacture; carbon tetrachloride causes cancer in animals January 1, 1996 Methyl chloroform(1,1,1-trichloroethene) very widely-used solvent; in many workplace and consumer solvents, including auto repair and maintenance products January 1, 1996 HCFCs(hydro CFCs) CFC substitutes, chemicals slightly different from CFCs January 1, 2003** * Please give four major air pollution effects. What is theshold value? Effects on human health Effects on Properties Effects on visibility (aesthetics) Effects on global climate ( global warming and Stratospheric ozone depletion) Threshold value represents conditions under which it is believed that nearly all workers may be repeatedly exposed day after day ,