Search results with tag "Ozone layer"
Phasing out HCFC refrigerants to protect the ozone layer
www.epa.govHCFCs and the Ozone Layer. The stratospheric ozone layer shields the Earth . from the sun’s harmful ultraviolet radiation. Emissions of certain synthetic chemicals—including CFCs, halons, and HCFCs—destroy the ozone layer, and have created an “ozone hole” over the South Pole. Through the . Montreal Protocol on Substances that Deplete ...
History of Chlorofluorocarbons
www.meti.go.jpthe ozone layer. CFCs are broken down by the sun's ultraviolet rays, and chlorine atoms are released into the ozone layer, thus causing a chain resolution of the ozone layer. Harmful ultraviolet rays reaching the Earth increase. the stratosphere sunbeams the troposphere the ozone Layer CFCs (Case of CFC-11) the sun's ultraviolet rays CFC-11 ...
Why has an “ozone hole” appeared over Antarctica when ...
csl.noaa.govOzone-depleting substances are present throughout the stratospheric ozone layer because they are transported great distances by atmospheric air motions. The severe depletion of the Antarctic ozone layer known as the “ozone hole” occurs because of the special meteorological and chemical conditions that exist there and nowhere else on the globe.
What is Ozone? Timeline of Stratospheric Ozone Depletion ...
www.nasa.govOzone is good in the stratosphere because it absorbs all of the most energetic ultraviolet radiation (UV-C), most of the UV-B radiation and some of the least energetic UV radiation (UV-A). Ozone is “bad” in the troposphere because it is harmful to breathe and is the primary component of smog in summer. Chemistry of the Ozone Layer
Montreal Protocol on Substances that Deplete the Ozone Layer
treaties.un.orgJan 01, 1989 · Ozone Depleting Substances], UNEP/IG.93/3 and Rev. 1; Reports of the Ad Hoc Working Group of Legal and Technical Experts for the Elaboration of a Protocol on Chlorofluorocarbons to the Vienna Convention for the Protection of the Ozone Layer (Vienna Group), UNEP/WG.151/L.4, UNEP/WG.167/2 and UNEP/WG.172/2.
No. 26369 MULTILATERAL Layer (with annex). Concluded at ...
treaties.un.orgdify the ozone layer, Recognizing that world-wide emissions of certain substances can significantly deplete and otherwise modify the ozone layer in a manner that is likely to result in adverse effects on human health and the environment, Conscious of the potential climatic effects of emissions of these substances,
THE VIENNA CONVENTION FOR THE PROTECTION OF THE …
legal.un.orgThe ozone layer protects the earth against excessive ultraviolet radiation, which could cause damage and mutations in human, plant, and animal cells. The scientists found that the chlorofluorocarbon gases (CFCs), which were widely used and viewed as posing no harm, could migrate to the stratosphere, remain intact for decades to centuries, and ...
Hydrofluoroalkane as a propellant for pressurized …
www.scielo.br442 Jornal de Pediatria - Vol. 80, No.6, 2004 Hydrofluoroalkane as a propellant for inhalers ΠIbiapina CC et alii The hole in the ozone layer formed over Antarctica, ...
Chapter a I to ChemIstry
preparatorychemistry.comthreaten the Earth’s protective ozone layer. The durable plastics that chemists created have proved . too. durable, so when they are discarded, they remain in the environment for a long, long time. One of the messages you will find in this book is that despite the occasional mistakes and failures, most chemists have a strong social conscience ...