Chlorofluorocarbons and Hydrofluorocarbons Have Which of the Following in Common

EPA made the standards more protective because new peer-reviewed scientific studies showed that existing standards were. These fluorinated gases F-gases do not damage the ozone layer but do have a significant global warming effect.

Apa Arti Cfcs Dalam Bahasa Indonesia

Chlorofluorocarbons CFCs and hydrochlorofluorocarbons HCFCs.

. EPA in recent years revised standards for five of the six common pollutants subject to national air quality standards. Therefore in 2016 Parties to the Montreal Protocol agreed to add the most common type of F-gas hydrofluorocarbons HFCs to the list of controlled substances. Hydrofluorocarbons HFCs and to a lesser extent perfluorocarbons PFCs are used as substitutes for the regulated ODSs.

Throughout the second half of the 20th century nearly all air conditioners used chlorofluorocarbons CFCs as their refrigerant but because these chemicals are damaging to Earths ozone layer CFC production stopped in the United States in 1995. Nearly all air conditioning systems now use halogenated chlorofluorocarbons HCFCs as a refrigerant. Following the discovery of this environmental issue researchers sought a better understanding of this threat to the ozone layer.

These trends were linked to growing production and use of chemicals like chlorofluorocarbons CFCs for spray can. Newer scientific studies have shown that some pollutants can harm public health and welfare even at very low levels. For more information see the Fluorinated greenhouse gases section.

Monitoring stations showed that the abundances of ozone-depleting substances ODSs were steadily increasing in the atmosphere. However in accordance with the Clean Air Act Amendments of 1990 Title VI and the Montreal Protocol these ODSs are being phased out of manufacture and use in the United States.

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