Gaseous organochlorine pesticides (OCPs : heptachlor epoxide, p , p′-DDE, γ-HCH, α-chlordane, γ-chlordane and trans-nonachlor) concentration was measured using PUF high volume sampler from June, 2000 to June, 2002 in the semi-rural atmosphere. The OCPs concentration in atmosphere, which is estimated by the slope (m) of Clausius-Clapeyron equation and phase-transition energy (?H), was influenced by revolatilization from environmental matrix (soil, water and tree leaves) and a long range transportation of air mass. But the former affected OCPs concentration more than the latter. The degradation rate constants (k) of OCPs calculated using multiple regression analysis and revised standard temperature method were in good agreement each other. The value of k of γ-HCH was very low as -0.0007, but the range of k of other components were -0.0018~ -0.0038. The half-life (τ) which was calculated by k of γ-HCH was 2.6 years-the longest one, but that of heptachlor epoxide was in 0.5 year-the shortest one. τ of α-chlordane, γ-chlordane and trans-nonachlor in technical chlordane was 1.0, 1.1 and 0.7 year respectively.
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