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Fig. 5. Example of three-day back trajectories from 24 Oct. 1998 and 30 Aug. to 1 Sept. 1999 during which methyl tertiary butyl ether (MTBE) at Blodgett Forest (Blo) was at or below the detection limit, while toluene was still detectable. SF and Sac indicate the longitude of the urban centers Sacramento (Central Valley) and San Francisco (west coast). Three additional trajectories from June 1999 with "normal" flow through the Central Valley are depicted as well.
