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Ozone-Depleting Substances | US EPA
https://www.epa.gov/ozone-layer-protection/ozone-depleting-substances
WEB65 rows · May 11, 2023 · Although ozone depleting substances, they are less potent at destroying stratospheric ozone than chlorofluorocarbons (CFCs). They have been introduced as temporary replacements for CFCs and are also greenhouse gases. See …
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Chlorofluorocarbons and Ozone Depletion - American …
https://www.acs.org/education/whatischemistry/landmarks/cfcs-ozone.html
WEBThe Antarctic ozone hole, as it came to be known, made depletion of the ozone layer a real and present danger to lawmakers and the public at large. Predictions of significant increases in the incidence of skin cancer …
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Ozone depletion - Wikipedia
https://en.wikipedia.org/wiki/Ozone_depletion
OverviewResearch historyOzone cycle overviewObservations on ozone layer depletionOzone hole and its causesEffectsPublic policyProspects of ozone depletionThe basic physical and chemical processes that lead to the formation of an ozone layer in the Earth's stratosphere were discovered by Sydney Chapman in 1930. Short-wavelength UV radiation splits an oxygen (O 2) molecule into two oxygen (O) atoms, which then combine with other oxygen molecules to form ozone. Ozone is removed when an oxygen atom and an ozone molecule "recombine" to form two oxygen molecules, i.e. O + O 3 → 2O 2. In the 1950s, David …
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Global increase of ozone-depleting chlorofluorocarbons from …
https://www.nature.com/articles/s41561-023-01147-w
WEBApr 3, 2023 · The combined emissions of CFC-13, CFC-112a, CFC-113a, CFC-114a and CFC-115 increased from 1.6 ± 0.2 to 4.2 ± 0.4 ODP-Gg yr-1 (CFC-11-equivalent ozone …
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CFCs and their substitutes in stratospheric ozone …
https://gml.noaa.gov/hats/about/cfc.html
WEBCFCs can destroy stratospheric ozone. Whereas CFCs are safe to use in most applications and are inert in the lower atmosphere, they decompose in the upper atmosphere or stratosphere.
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Ozone-Depleting Substances | Ozone Layer Protection | US EPA
https://19january2021snapshot.epa.gov/ozone-layer-protection/ozone-depleting-substances_.html
WEBAlthough ozone depleting substances, they are less potent at destroying stratospheric ozone than chlorofluorocarbons (CFCs). They have been introduced as temporary …
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Basic Ozone Layer Science | US EPA
https://www.epa.gov/ozone-layer-protection/basic-ozone-layer-science
WEBOct 7, 2021 · Gaseous CFCs can deplete the ozone layer when they slowly rise into the stratosphere, are broken down by strong ultraviolet radiation, release chlorine atoms, …
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Study predicts the oceans will start emitting ozone-depleting …
https://news.mit.edu/2021/oceans-emitting-cfc-ozone-0315
WEBMar 15, 2021 · CFC-11 is a chlorofluorocarbon that was commonly used to make refrigerants and insulating foams. When emitted to the atmosphere, the chemical sets off …
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Emissions of several ozone-depleting chemicals are …
https://news.mit.edu/2020/emissions-ozone-cfc-chemicals-0317
WEBMar 17, 2020 · Based on earlier analyses, scientists concluded that CFC banks would be too small to contribute very much to ozone depletion, and so policymakers allowed the banks to remain. It turns out there are …
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