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Atmospheric Deposition is a term that collectively refers to two processes, one of which is more commonly characterized as "acid rain". Acid rain, or wet deposition, may occur as a result of precipitation such as rain, snow, sleet, hail, or fog; dry deposition may also occur as dry particles or dust settling out of the atmosphere. The gasses in the atmosphere that contribute to the development of these acids come from both natural sources, such as volcanoes or the decomposition of organic matter, and from anthroprogenic, or man-made sources such as automobiles and boilers. Samples from this program are composites of precipitation events collected over a one week period. Samples are usually collected at 9:00 AM each Tuesday. Field chemistry measurements are then taken before the sample is shipped to the Central Analytical Laboratory in Illinois where additional measurements are taken. Final data can be accessed at the National Atmospheric Deposition Program web site. Field chemistry measurement data is available from the DEP sponsored sites highlighted below. Data from the other sites can be obtained from the NADP web site.
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