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Rain washout

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rain washout

Capture of particulates and gaseous pollutants by falling raindrops.

In both cases, a "washout coefficient" (W_p) can be estimated that expresses the fractional depletion (X/X₀) of the pollutant during a washout period t:

where X₀ is the initial pollutant concentration and X is the concentration at time t later.

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