The apparent @A00028@ of the incident radiation due to @S05487@. For small particles, direct proportionality exists between turbidity and the @R05159@.
Source: Purple Book, 1st ed., p. 66 [Terms] [Book]
See also: PAC, 1990, 62, 2167. (Glossary of atmospheric chemistry terms (Recommendations 1990)) on page 2218 [Terms] [Paper]