Particulate Pollutants

Particulate - ENV 4101/5105 Elements of Air Pollution Spring 2007 Particulate Pollutants Prepared by Ying Li Particulate Pollutants Introduction

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Particulate Pollutants Particulate Pollutants ENV 4101/5105 Elements of Air Pollution, Spring 2007 January 24, 2007 Prepared by: Ying Li
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Particulate Pollutants Introduction Atmospheric Aerosol Sources (natural vs. urban aerosol) Particle size (three modes) – Particle concentration – Chemical composition – Dynamic processes (formation, growth, removal) Visibility Effect of Particulates Light extinction Visual range Valuable learning materials: Online Module of Atmospheric Aerosol http://aerosol_beta.ees.ufl.edu Reading materials: Godish, Air Quality, Chp.2, pp 55-67.
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Introduction Particle vs. Aerosol Aerosol: solid or liquid particles suspended in air Primary vs. Secondary Particles Primary particles – introduced directly into the atmosphere (e.g. smoke from combustion) Secondary particles – formed by chemical reactions in the atmosphere (e.g. gas-to-particle conversion) Natural vs. Anthropogenic Aerosol Natural – dominates in rural (remote) areas Anthropogenic – dominates in urban areas Effects of Atmospheric Aerosol Health, Welfare, Climate, Visibility
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Sources of Atmospheric Aerosol TABLE 1 Sources and Estimates of Global Emissions of  Atmospheric Aerosols  (Data from: W.C. Hinds, Aerosol  Technology, 2nd Edition, Wiley Interscience)  Source Amount, Tg/yr [10 6  metric  tons/yr]  Range Best Estimate  Natural       Soil dust  1000 - 3000  1500 Sea salt  1000 - 10000 1300 Botanical debris  26 - 80  50 Volcanic dust  4 - 10000  30 Forest fires  3 - 150  20 Gas-to-particle conversion  100 - 260  180 Photochemical 40 - 200  60 Total for natural sources   2200 - 24000  3100 Anthropogenic       Direct emissions  50 - 160  120 Gas-to-particle conversion  260 - 460  330 Photochemical 5 - 25  10 Total for anthropogenic  sources   320 - 640  460                        Which emission source is  larger? Natural or  anthropogenic?
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This note was uploaded on 09/11/2011 for the course ENV 4101 taught by Professor Wu during the Spring '08 term at University of Florida.

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Particulate - ENV 4101/5105 Elements of Air Pollution Spring 2007 Particulate Pollutants Prepared by Ying Li Particulate Pollutants Introduction

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