MAPPING ODOR SOURCES FROM COMPLAINT STATISTICS .2. MORE THAN ONE SOURCE

A technique for locating a source of odor which is considered to be a community air pollution nuisance, PONG2, was described in Paper I. Sel ected members of the public are asked to record the times at which the y notice an unpleasant odor. A local meteorological station supplies t he Pasquill stability and the wind-speed and direction for the localit y at the time of complaint. This data is used to determine a region up wind of the location of the complaint in which the source of odor may lie. By overlaying the different regions generated by different compla ints, PONG2 identifies the most probable location of the odor source. In this paper an enhanced form of PONG2 is used to identify odor sourc es when several may be involved. Simulations suggest a rule of thumb f or deciding when a location identified by PONG2 should be considered t o be a likely source of odor. The technique is applied to data from a survey conducted near Melbourne, Australia.