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Adrian Colton at the Mauna Loa Observatory shows how early flask samples werefilled at the site. Air collected year-round at MLO and eight other remotesites world-wide has been analyzed for the industrial solvent methyl chloroform.Variability in the decay of this chemical helps scientists understand thecleansing power of the global atmosphere and its sensitivity to perturbations. (Image credit: NOAA News January 6 2011)