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Ozone: Good Up High, Bad Nearby
It can take years for ozone depleting chemicals to reach the stratosphere, and even though we have reduced or eliminated the use of many CFCs, their impact from years past ... Toxics and Pesticides Water Quality Wildlife Almanac Search Web policyalmanac.org Policy Resources Political Magazines: The Almanac's links to political and public policy magazine sites. Public Policy Jobs: Sites listing ...
www.policyalmanac.org

Controversy
Atmospheric researchers also agree there are a great many unanswered questions concerning ozone depletion. The big question which generates disagreement is: is there sufficient data and sufficient consequences to justify ... s can deplete a huge amount of ozone. CFC's take up to 15 years to reach the stratosphere but can stay in the atmospere from 50-200 years. This means that ...
www.nas.nasa.gov

Special Pollutant: Chlorofluorocarbons (CFCs) - Minnesota Pollution Control Agency
Specifically, stratospheric ozone loss can result in potential harm to human health and the environment, such as: increased incidence of skin cancer and cataracts, damage to terrestrial and aquatic plant ... lower atmosphere by rain, snow and ice and does not reach the stratosphere. Some compounds are more harmful to the ozone layer than others. Each compound is measured in terms of ...
www.pca.state.mn.us

Terms Beginning With "O"
One-hit Model: A mathematical model based on the biological theory that a single "hit" of some minimum critical amount of a carcinogen at a cellular target ... of certain chlorine and/or bromine containing compounds (chlorofluorocarbons or halons), which break down when they reach the stratosphere and then catalytically destroy ozone molecules. Ozone Hole: A thinning break in ...
epa.gov

Faq
UV radiation and give rise to ozone ... conditioning industry. Furthermore, because of their inherent safety characteristics, they are also being used by the pharmaceutical industry as propellants in medical aerosols such as asthma inhalers. It was always known ...
fluorocarbons.org

Science - Ozone Depletion
The chlorine atoms within them are released and directly attack ozone. In the process of destroying ozone, the chlorine atoms are regenerated and begin to attack other ozone molecules... and so on, for thousands of cycles ...
www.ozonelayer.noaa.gov

The ozone layer, depletion and uv radiation
But once they are there, under the influence of the sun's ultraviolet light, chlorine is released and react ... pipes, gutters, etc. used in buildings degrade faster. Source: UNEP/GEMS library series no 7: The Impact of Ozone layer depletion UV radiation. Definitions Ultraviolet RadiationUltraviolet radiation is divided into three ...
www.eco-action.org

Plain English Guide To The Clean Air Act
These new flexible programs are called market or market-based approaches. ... summer. Between 1978 and 1991, there was a 4-5 percent loss of ozone in the stratosphere over the United States; this is a significant loss of ozone. Ozone holes have also been ...
www.policyalmanac.org

Science - The Antarctic Ozone Hole
Owing to regulations on the production and use of certain ozone-destroying chlorinated compounds, which went into effect in January 1996 ... -made substances has begun to decline. Chlorine/bromine should reach maximum levels in the stratosphere in the first few years of the 21st century, and ozone concentrations should correspondingly be at ...
www.ozonelayer.noaa.gov

The Tropical Rainforest: Why we should care. - El Bosque Nuevo - Costa Rica
It takes thousands of years for a forest to regenerate. Pest animal species ... rain differently so that desertification can advance where once there were forests. High in the stratosphere the ozone layer and the greenhouse effect will be altered. These are results of deforestation. ...
elbosquenuevo.org