Ozone depletion

Chlorodifluoromethane or difluoromonochloromethane is a hydrochlorofluorocarbon (HCFC) with chemical formula 2 and CAS number 75-45-6. It is better known under its code names of HCFC-22, R-22, Halocarbon R22 or Freon 22, and is commonly used in air conditioning applications, such as rooftop units and window air conditioners. ...more on Wikipedia about "Chlorodifluoromethane"

Dichlorodifluoromethane (R-12), usually sold under the brand name Freon-12, is a chlorofluorocarbon halomethane used as a refrigerant and aerosol spray propellant until its manufacture was discontinued in 1995, due to concerns about damage to the ozone layer. The ozone depletion potential of R-12 is 0.82, which is relatively high. Its chemical formula is 2 2 and its CAS number is 75-71-8. ...more on Wikipedia about "Dichlorodifluoromethane"

Ozone (O3) is an allotrope of oxygen, the molecule consisting of three oxygen atoms instead of the more stable diatomic O2. ...more on Wikipedia about "Ozone"

Ozone depletion refers to the phenomenon of reductions in the amount of ozone in the stratosphere. There was a reduction of approximately 5% detected from 1979 to 1990. Since the ozone layer prevents most harmful UVB wavelengths (270- 315 nm) of ultraviolet light from passing through the Earth's atmosphere, observed and projected decreases in ozone have generated worldwide concern and led to adoption of the Montreal Protocol banning the use of chlorofluorocarbon ( CFC) compounds, as well as other ozone depleting chemicals such as carbon tetrachloride, trichloroethane (also known as methyl chloroform), and bromine compounds known as halons. Note: UVA (320 to 400 nm) wavelengths, also associated with the formation of skin cancer, eye cataracts, and material damage, are not significantly absorbed by ozone. ...more on Wikipedia about "Ozone depletion"

The ozone depletion potential (ODP) of a chemical compound is the relative amount of degradation to the ozone layer it can cause, with trichlorofluoromethane (R-11) being fixed at an ODP of 1.0. Chlorodifluoromethane (R-22), for example, has an ODP of 0.05. ...more on Wikipedia about "Ozone depletion potential"

The ozone layer, or ozonosphere, is that part of the Earth's stratosphere which contains relatively high concentrations of ozone (O3). "Relatively high" means a few parts per million, much higher than the concentrations in the lower atmosphere but still small compared to the main components of the atmosphere. The ozone layer was discovered in 1913 by the french physicists Charles Fabry and Henri Buisson. Its properties were explored in detail by the British meteorologist G.M.B. Dobson, who developed a simple spectrophotometer that could be used to measure stratospheric ozone from the ground. ...more on Wikipedia about "Ozone layer"

The ozone-oxygen cycle is the process by which ozone is continually regenerated in Earth's stratosphere, all the while converting ultraviolet radiation into heat energy. In 1930 Sidney Chapman resolved the chemistry involved. ...more on Wikipedia about "Ozone-oxygen cycle"

The Scientific Assessment of Ozone Depletion is a sequence of reports sponsored by WMO/ UNEP. The most recent is the 2002 report . ...more on Wikipedia about "Scientific assessment of ozone depletion"

The Total Ozone Mapping Spectrometer (TOMS) is a satellite instrument for measuring ozone values. Versions have flown aboard 4 different satellites for the past 30 years: Nimbus-7 and Meteor-3 provided global measurements of total column ozone on a daily basis and together provide a complete data set of daily ozone from November 1978 - December 1994. After an eighteen month period when the program had no on-orbit capability, ADEOS TOMS was launched on August 17, 1996 and provided data until June 29, 1997. Earth Probe TOMS was launched on July 2, 1996 to provide supplemental measurements, but was boosted to a higher orbit to replace the failed ADEOS. Earth Probe continues to provide near real-time data ** . ...more on Wikipedia about "Total Ozone Mapping Spectrometer"

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