ENV200H1 Lecture Notes - Tropospheric Ozone, Volatile Organic Compound, Montreal Protocol
11 Feb 2013
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Document Summary
Results from secondary reactions (doesn"t come out of cars directly) of air pollutants and contributes to smog formation in urban center. Nox (nitrogen & oxygen) +vocs (volatile organic compounds) produce o3 in the presence of sunlight. Adversely affect crop and forest vegetation, human respiratory health. Ozone: naturally produced component in the stratosphere. Shields earth"s surface from uv radiation, and therefore essential. In 1976 thinning of ozone over antarctica and hit record low levels in 2000. Cfc"s (chlorofluorocarbons), halons, industrial solvents (refrigeration systems) These chemicals were cheap and easy to produce. Industry substitutes such as hydro fluorocarbons do not attack ozone but are potent greenhouse gases. The single most successful international agreement to date . Arctic ozone hole covering 2 million km squared reported in spring 2011 (nature) The hole initially formed over the arctic, then spread across northern canada, northern.
