EU proposes tighter rules on ozone depleters

Article Abstract:

The European Union (EU) has advanced its timetable for the phaseout of hydrochlorofluorocarbons (HCFC)and other ozone-depleting substances, well advanced of the timetable set in the Montreal Protocol. The EU plans to phase out methyl bromide, a pesticide, by 2001 instead of 2005 as specified in the Montreal Protocol. The EU also plans to speed up the phase-out of HCFCs, planning a production level-off by 2008 and its phaseout by 2025. Industry leaders criticize this action by the European Union, saying that the economic advantages will be passed on to less constrained countries. But EU officials hope to leverage the early phaseout as a competitive advantage, especially with the development of new products.

Administration of Air and Water Resource and Solid Waste Management Programs, Air Pollution Control Programs, Political aspects, Air pollution control, European Union, Environmental policy

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Atmospheric chemical reactivity and ozone-forming potentials of potential CFC replacements

Article Abstract:

A study aimed at determining the ozone-forming potentials of hydrochlorofluorocarbons (HCFCs) and hydrofluorocarbons (HFCs) is presented. There is a need to develop possible chlorofluorocarbons (CFC) replacements because the CFCs, which were found to be the main cause of ozone depletion, will soon be phased out. The HFCs and HCFCs are believed to be possible replacements to the CFCs because of their physicochemical properties which are identical to those of the CFCs. The study utilized a photochemical trajectory model in determining the photochemical ozone creation potentials (POCPs) of HCFCs and HFCs.

Models, Photochemical research, Chlorofluorocarbons

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Estimating tropospheric lifetimes and ozone-depletion potentials of one-and two-carbon hydrofluorocarbons and hydrochlorofluorocarbons

Article Abstract:

The tropospheric lifetimes and ozone-depletion potentials (ODP) of hydrofluorocarbons (HFCs) and hydrochlorofluorocarbons (HCFCs) are dependent on the number of hydrogen atoms, molecular weight, number of carbons, and the ratio of chlorine and fluorine to hydrogen. The lifetimes and ODP for 53 one- and two-carbon HFCs and HCFCs are estimated. Algorithms for determining both lifetimes and ODPs are given.

Tropospheric chemistry

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