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… foams and other applications. But because of their chemical stability, CFCs and other related substances But because of their chemical stability, CFCs and other related substances remain … in refrigerators, air conditioners, insulating foams and chemical CFCs still exist in refrigerators, air conditioners, …

… risks posed by persistent organic pollutants, which are chemical substances that possess toxic properties, resist … UNEP in response to scientific evidence that widely used chemical substances, chlorofluorocarbons, were destroying the … into the troposphere and lower stratosphere and associated chemical reactions157 causes changes in atmospheric …

… greenhouse gases alters the thermal structure and chemical composition of the mesosphere significantly. Rashid … ‘transboundary air pollution’ means any physical, chemical or biological alteration in the composition or … or combination of such agents, including any physical, chemical, biological, radioactive … substance or matter which …