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A study of the green area effect in the Black Hills of South Dakota



A study of the green area effect in the Black Hills of South Dakota



Atmospheric Environment 10(5): 363-370



Bimonthly sampling of Aitken and larger particles for 12 mo. in the Black Hills of South Dakota, USA, revealed several possible particle removal mechanisms. The measurements were made using a Gardner small particle counter at 13 stations surrounding and within the Black Hills proper. The Black Hills area is a significant source of clean air. Observed low levels of particle concentrations are primarily the result of precipitation and in-cloud scavenging, elevation variation, and the particle removal mechanism of vegetation (green-area effect). After correcting the data for elevation changes, precipitation scavenging and local pollution sources, present analysis suggests the operation of a significant particulate filtering mechanism by the heavy vegetation of the Black Hills. The green area effect alone may serve to reduce ambient Aitken particle concentrations by as much as 50%.

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