Author(s)

P.M. Midgley, A. McCulloch and P.O. Simmonds

Abstract

The Phase-Out of Methyl Chloroform and the Decline in Tropospheric Chlorine Guest Contribution P.M. Midgley*, A. McCulloch^ and P.O. Simmonds^ *M & D Consulting, Ludmgstrafie 49, 70771 Leinfelden, Germany *ICI Chemicals & Polymers Ltd, P.O. Box 13, The Heath, Runcom, WA7 4QF, UK ^ School of Chemistry, Bristol University, Cantock's Close, Bristol, BS8 ITS, UK Production, sales and emissions Starting in the late 1980s, the chemical industry voluntarily reported annual production and sales of methyl chloroform (1,1,1-trichloroethane, CHgCCls). The purpose of the audited surveys was to provide the scientific community with information on its atmospheric release. The audited data combined with an analysis of the pattern and time-scale of uses and releases were used to calculate annual emissions to the atmosphere, latterly distributed on a 1° x 1° grid. The data collection process has been extensively described in a s

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