ENSC 201 Lecture Notes - Lecture 15: Ozone Depletion, Chlorofluorocarbon, Photodissociation
11 Apr 2017
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Document Summary
Atmospheric pollution: substances that are released into the atmosphere, deliberately or inadvertently, from natural or anthropogenic sources and that have the potential to be toxic or cause harm. Types of compounds that contribute to air pollution. Gases: ch4, co2, so2, nox, volatile organic compounds (vocs), some chlorinated hydrocarbons, btex, dimethylmercury. Aerosols: sulphates, fine droplets of organic material. Particulates: soot (carbon); various oxides and salts of metals and other inorganics; chemical mixtures of particles with organic substances absorbed onto them. Major concerns for air pollution specifically include human health effects of smog, acidification or surface waters, crop/forest damage, damage to built structures. Combustion of tel results in very small particles of lead compounds: 2. long range transport of lead in the small particles, 3. mosses as monitors of air-borne contaminants; 2: 4. regulation of lead in gasoline after 1977 reflected in lower concentrations in the monitor. Cfcs chlorofluorocarbons used as refrigerants and in aerosol cans.
