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Lagrangian approach for airshed models for source apportionment, 387-388 Langmuir adsorption of semivolatile organics, 414 Lapse rate, 26-28

Lead, as anthropogenic emission, 25 Leighton relationship, for nitric oxide, nitrogen dioxide, and ozone reactions, 265-266 Lifetimes calculating, 133-134 definition, 132

and half-lives of pollutants, 134 Light absorption basic relationships, 52-53 by particles, 365, 373-375, 789 visibility reduction and, 368-373 Light intensity measurements, 61-64, 73-76,

877-878 Light sources in environmental chambers, 876-877 intensity measurements, 61-64, 73-76, 877-878

Linear rollback model, of pollutant control,

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