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The transport of pollutants from the Los Angeles basin to remote sites in southern Nevada and northwestern Arizona has been fingerprinted by halocarbons. One instance of episodic transport driven by a synoptic scale pressure gradient reversal is discussed wherein there was minimal mixing and broadening of the pollution front during transit. The particulate loading within the polluted air parcel was found to be vertically homogeneous suggesting that it did not originate from subsidence of an elevated pollution layer. The relationship between this event and the ’climatological’ data presented by White et al. (1991, Conf. Proc. Tropospheric Ozone and the Environment) is discussed with particular regard to the atypically short transport time.