may 19 - Outline • Gases to particles • Gas or particle...

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Unformatted text preview: Outline • Gases to particles • Gas or particle? • T and RH dependence • Examples of atmospheric aerosols – Dust + smoke • Sizes and modes • Ambient air quality standards (Federal vs. CA) • Formation processes • Size metrics • Chemistry vs. size • Lifetime • Environmental impacts Size Modes ead Box 3-2 Size-Source-Chemistry Relationship Fine Coarse Coarse Fine PM 1 r s m 3 w * * * A n n u a l A r i t h m e t i c M e a n * * T h e r e i s n o s e p a r a t e 2 4- h o u r P M 2 . 5 s t a n d a r s m 3 w * * * A n n u a l A r i t h m e t i c M e a n * * T h e r e i s n o s e p a r a t e 2 4- h o u r P M 2 . 5 s t a n d a California Ambient Air Quality Standards Size-Source-Chemistry Relationship Fine Coarse Coarse Fine PM 1 PM 2.5 California Ambient Air Quality Standards Formation processes for different size modes Figure 9.10 in book… Examples Chemical complexity of atmospheric aerosols Highly complex (~10 10 molecules in 1 m particle) Thousands of organic species (only 10-15% identified)...
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may 19 - Outline • Gases to particles • Gas or particle...

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