Lectures_12 - Air Pollution Mexico city Contents Air...

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Unformatted text preview: Air Pollution Mexico city Contents Air pollution Air Quality Sources of Pollution anthropogenic Natural Types of air pollution Gaseous, particulate Primary, secondary SMOG (then and now) Acid rain Contents ctd Extent Urban Regional Global Stratospheric Ozone Canada AQ regulations Satellite experiments Looks dirty: is it? Mostly water from cooling towers Looks pristine: is it? Mercury, PCBs Often things are not what they seem! Air Pollution - Impacts Harmful (generally) to the ecosystem Humans, animals, fish, forests, phytoplankton, savanah etc Gases, e.g. mercury, PCBs Particles, metals etc UV radiation (secondary effect) Aesthetic effects Visual, property destruction Visual Effects of air pollution Denver Types of air pollution Gaseous (primary and Secondary and climate related ) Carbon monoxide CO Nitrogen oxides NO + NO2 called NOx Sulphur Dioxide SO2 Volatile Organic Compounds VO Cs Ozone Chloroflourocarbons (CFCs) Carbon dioxide - CO2 Types of air pollution ctd Particulate (primary and secondary ) Dust Sea salt Sulphate SO4 Nitrate Organic particles Acid rain Soot (black carbon) Types of air pollution ctd Particulate size 10 nanometres up to 10 micrometres ( m) and more Generally, the smaller the more severe impact on peoples health Measurements PM 2.5 m new PM 10 m Sources of Air pollution Natural Anthropogenic Natural Sources Wild fires in California MODIS (Terra) 6 July, 2002 Fires in Quebec 2002 Forests - Natural Source of Gases and particles Biogenics Natural CO anthropogenic NOx - anthropogenic SO2 and sulphate anthropogenic Volatile Organic Compounds Particulate Matter, PM10 Emissions of pollutants (USA) Type of pollutant Source of Pollutant Tropospheric Ozone production Burning produces mostly NO NO + HO 2 NO 2 + OH NO 2 + sunlight + O 2 NO + O 3 CO + OH (+O2) CO 2 + HO 2 Net: CO + 2O 2 + sunlight CO 2 + O 3 NO and HO2 Catalyze ozone production Source to Sink...
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Lectures_12 - Air Pollution Mexico city Contents Air...

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