10.Part.Matter.11

10.Part.Matter.11 - Particulate Matter in the Environment...

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Unformatted text preview: Particulate Matter in the Environment Introduction Atmospheric Aerosols Properties and Environmental Behavior Aquatic Matter Properties and Environmental Behavior Summary and Conclusions II. Atmospheric Aerosols Dust = particulates formed by the mechanical subdivision of solids into airborne fines (>1 u dia.) Mist = droplets formed by the mechanical shearing of liquids, such as atomization (2-50 u dia.) Fume = particulates formed by the condensation of vapors at high temperatures (<1 u dia.) Fog = droplets formed by the condensation of vapors at low temperatures (>1 u dia.) Haze = hygroscopic solid particles that attract Aerosols – continued Smoke = mixture of liquid droplets (water, etc.), solid particulates (ash, PAHs, etc.) and various gases (CO, CO 2 , etc.) formed by combustion Smog = first coined to describe the choking fogs of London, a mixture of smoke + fog Viable particles = biological particulates – pollens, spores, bacteria and viruses (can be airborne in a liquid mist, like a sneeze) Why Care About Aerosols? Reduction in visibility and air quality Reduction in tourism Health considerations 2.5-3 2.5-3 Pittsburgh, USA July 2, 2001 July 18, 2001 7/25/08 1 -3 8/31/08 1-3 Beijing, China Aerosols >1 - 5 u dia. are filtered out in upper...
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This note was uploaded on 03/10/2011 for the course ETX 102A taught by Professor Ronaldtjeerdema during the Winter '10 term at UC Davis.

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10.Part.Matter.11 - Particulate Matter in the Environment...

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