Abstract
Over the last two years atmospheric measurements of methylchloroform (CH3CCl3) have been made at six locations using EC/GC techniques. The concentrations are reported, and it is shown that CH3CCl3 concentrations increased at rates of 3.8%±2.1% per year at Alaska (∼70°N) between 8/79 and 1/81, 6.6%±3.2% per year at Oregon (∼45°N) between 1/79 and 1/81, 4.3%±4% per year at Hawaii (24°N) between 11/79 and 1/81, 4.1%±4.8% per year at Samoa (14°S) between 2/80 and 1/81, 11.5%±1.5% per year at Tasmania (42°S) between 1/79 and 6/80, and at 8.7%±5.7% per year at the south pole between 1/79 and 1/81. These recent yearly increases are smaller than earlier rates of increase but are consistent with a lifetime of ∼7 years (6 years‐10 years) and a decline in the rate of global emissions.
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