EPA in July finalized a rule to prohibit certain uses of hydrofluorocarbons -- a class of potent greenhouse gases used in air conditioning, refrigeration and other equipment -- in favor of safer alternatives. The International Agency for Research on Cancer has not designated chlorofluorocarbons as a group in terms of their carcinogenicity.
The hydrochlorofluorocarbons HCFCs are less stable in the lower atmosphere, enabling them to break down before reaching the ozone layer.
For example the combination of different states of matter like gaseous particles with liquid particles such as aerosol which arises from the dust particles of volcanic eruptions, forest fires etc.
Where does it come from? In conjunction with other industrial peers DuPont formed a lobbying group, the "Alliance for Responsible CFC Policy," to combat regulations of ozone-depleting compounds. Pollutants can be defined as the naturals or artificial i. In a self-funded research expedition ending inLovelock went on to measure CFC in both the Arctic and Antarctic, finding the presence of the gas in each of 50 air samples collected, and concluding that CFCs are not hazardous to the environment.
Chlorofluorocarbons CFCs are a group of compounds which contain the elements chlorine, fluorine and carbon. Numerous categories of stationary sources emit air toxics, including power plants, chemical manufacturing, aerospace manufacturing and steel mills. However, exposure to chlorofluorocarbons at normal background levels is unlikely to have any adverse effect on human health.
These gases are produced by a numerous and diverse human activities.
The main legislation controlling releases of CFCs is the Montreal Protocol, which came into force in What steps are being taken to limit the potential impacts? Those most vulnerable to climate related health effects - such as children, the elderly, the poor, and future generations - face disproportionate risks.
Most CFCs have been released to the atmosphere through the use of aerosols containing them and as leakages from refrigeration equipment. What is it used for?
These chemicals are listed in detail below: Permitted chlorofluoroalkane uses are medicinal only. Carbon dioxide and other greenhouse gas pollution leads to more frequent and intense heat waves that increase mortality, especially among the poor and elderly.
Benzene and formaldehyde are two of the biggest cancer risk drivers, and acrolein tends to dominate non-cancer risks. Symptoms of exposure to chlorofluorocarbons can include drowsiness, slurred speech, disorientation, tingling sensations and weakness in the limbs.
Air pollution is caused both of indoor as well as outdoor activities. These programs recycle halon through "halon banks" coordinated by the Halon Recycling Corporation  to ensure that discharge to the atmosphere occurs only in a genuine emergency and to conserve remaining stocks.
Other releases may occur from industry producing and using them and other products containing them. Although the amounts emitted are relatively small, they have a powerful warming effect a very high "Global Warming Potential".
Dermal contact with chlorofluorocarbons can cause skin irritation and dermatitis.
In addition, EPA has reduced the benzene content in gasoline, and has established stringent emission standards for on-road and nonroad diesel and gasoline engine emissions that significantly reduce emissions of mobile source air toxics.
NASA projection of stratospheric ozone, in Dobson unitsif chlorofluorocarbons had not been banned. Hydrofluorocarbons are included in the Kyoto Protocol because of their very high Global Warming Potential and are facing calls to be regulated under the Montreal Protocol [ dubious — discuss ]  due to the recognition of halocarbon contributions to climate change.
This is an international agreement which obliged most signaturies to completely phase out their use of CFCs by Ozone Layer Protection The stratospheric ozone layer is Earth’s “sunscreen” – protecting living things from too much ultraviolet radiation. The emission of ozone depleting substances has been damaging the ozone layer.
Spread the knowledgeWHAT IS AIR POLLUTION? Air pollution is the contamination of the atmosphere with the different harmful pollutant gases & chemical or biological agents which arise the problem for the breathing of species living on earth. Chlorofluorocarbons or CFCs: These are air pollutants released from the different.
CFCs are widely used as coolants in refrigeration and air conditioners, as solvents in cleaners, particularly for electronic circuit boards, as a blowing agents in the production of foam (for example fire extinguishers), and as propellants in aerosols.
Smog hanging over cities is the most familiar and obvious form of air pollution. But there are different kinds of pollution—some visible, some invisible—that contribute to. Chlorofluorocarbons (CFCs) are anthropogenic compounds that have been released into the atmosphere since the s in various applications such as in air-conditioning, refrigeration, blowing agents in foams, insulations and packing materials, propellants in aerosol cans, and as solvents.
Despite the dramatic progress to date, air pollution continues to threaten Americans’ health and welfare.
The main obstacles are climate change, conventional air pollution, and ozone layer depletion. Air Pollution: Current and Future Challenges. These chemicals include CFCs, halons, methyl chloroform and carbon tetrachloride.Download