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Atmospheric Aerosol


:: Section 4

Urban Aerosol

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III. Coarse-Particle Mode

The coarse-particle mode (particle size > 2.5 μm) consists of windblown dust, large salt particles from sea spray, and mechanically generated anthropogenic particles such as those from agriculture and surface mining. Because of their large size, the coarse particles readily settle out or impact on surface, so their lifetime in the atmosphere is only a few hours.