ozone depletion

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ozone depletion

The ongoing reduction of ozone in the stratosphere. Ozone (O3) is present in 1 ppm in the upper stratosphere, and it absorbs virtually all of the UV radiation from the sun; increased rates of sun-induced malignancies (e.g., melanomas) have been attributed to the destruction of the ozone layer. Ozone depletion is caused by the release of chloride ions from CFCs (chlorofluorocarbons) after release from air conditioners, spray cans, and manufacturing plants that produce electronics and plastics. CFCs degrade in the atmosphere, release chlorine and cause ozone destruction, remain free, or react with ozone to form ClO (chlorine monoxide); O3 is being depleted at a rate of 4–5% per decade.
References in periodicals archive ?
Chlorofluorocarbons (CFC), halons, methyl bromide, carbon tetrachloride (CTC), HCFC, hydro bromofluorocarbons (HBFCs) are ozone depleting substances. Dr SK Purkayastha, a senior office of DoE's Ozone Cell, said the CFC is one of the most common ozone depleting substances, which was used in refrigeration, air conditioning appliances, foam production, cleaning solvents, process agents and propellant etc.
'Please be informed that government of Botswana implemented activities under the Montreal Protocol that include among others, the institutional strengthening project for capacitating the national ozone office, the refrigeration management plan for setting ground for phase-out of ozone depleting substances, terminal phase out management plan (TPMP) for total phase out of chlorofluorocarbons (CFC), halons and methyl bromide.
The dates set for the phase-out of many ozone depleting substances (ODS) have been brought forward as more research and new technology have been developed.
The main objective of the Multilateral Fund for the Implementation of the Montreal Protocol is to assist developing country parties to the Montreal Protocol whose annual per capita consumption and production of ozone depleting substances (ODS) is less than 0.3 kg to comply with the control measures of the Protocol.
However, the use of ozone depleting substances in the country showed a highly uneven growth pattern with their consumption peaking in 2009, according to Qatar Statistics Authority (QSA) data for 2005-10.
Afridi said after adopting appropriate policy measures Pakistan was making all out efforts to achieve its target for phasing out the use of Ozone Depleting Substances and conversion of concerned industries into Ozone-friendly technology.
He was speaking at the Joint Meetings of South Asia and West Asia Ozone Depleting Substances Officers Networks for the Implementation of the Montreal Protocol which opened at the Gulf Hotel yesterday.
Regulation (EC) No 2037/2000 is the European Union's legislative instrument to phase out Ozone Depleting Substances (ODS).
In addition, the Regulation obliges Member States to respect other reporting requirements, including providing information on annual leak checks (for equipment containing more than 3 kg of ozone depleting substances), submitting data on the minimum qualification requirements for all personnel involved and communicating details on the quantities of controlled substances that have been recovered, recycled, reclaimed or destroyed.
Although it is too soon to expect to see improvement in the ozone layer, measurements indicate that it is deteriorating at a decreasing rate, and concentrations of some ozone depleting substances in the atmosphere are starting to decline.(2)
India, the world's second largest CFC producer, will phase out production of ozone depleting substances through a multimillion dollar grant project implemented through the World Bank.
In 1995, the parties to the Basel Convention agreed to ban the trade of ozone depleting substances controlled by the Montreal Protocol.