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 ?
Celli, a major manufacturer of power-driven tillage tools, has developed a system to reduce soil pathogens to replace methyl bromide, widely used throughout the world as a soil sterilant but being phased out as it is an ozone depleter (see sidebar).
Methyl bromide, which is still sometimes used as a termiticide, aerates more slowly and is an ozone depleter. The Environmental Protection Agency is phasing it out by 2005 in order to comply with Clean Air Act regulations.
The phaseout stems from evidence that methyl bromide is an ozone depleter, that is, a substance that destroys the protective ozone layer of Earth's atmosphere.
But it is an ozone depleter and is being phased out of use.
Also, 1,1,1 trichloroethane will be unavailable shortly, since it is an ozone depleter.
Then she excused herself on the subject of the Waste Technologies Industry (WTI) hazardous waste incinerator in East Liverpool, Ohio, which chugged anlong last year burning paint cans and other hazardous waste, the great symbol to grassroots activists across the country of an administrationn afraid to live up to its promises to investigate this plant ("You mean the Bush/Clinton administration," quipped one.) And at the end of the year, The EPA actually asked DuPont to slow down its phase out of CFC-12, an ozone depleter, on behalf o the auto industry, which still wants to use the chemical in it air conditioners.
(Molders take note: After the 11th of this month, companies using any CFCs or HCFCs in their processes will have to print warning labels either on their products or shipping containers, depending on the type of ozone depleter.)
Each mattress is certified by CertiPUR US, which means that the products are made without ozone depleters, PBDEs, TDCPP or TCEP ('Tris') flame retardants.
This halocarbon reclamation facility will be state of the art with the latest, most advanced equipment for the reclamation and management of Halons and refrigerants that are either ozone depleters or high in global warming potential.
The technique could be an alternative to conventional fumigation, as some of the gases used in fumigation are being restricted because they are ozone depleters and in many cases plant and factories have to be closed down while fumigation takes place.
NETTOGAZ Greenclean offers an effective flushing and cleaning replacement for the prohibited ozone depleters, R11 and R-141B, in new and existing refrigeration systems.
In the 14 years since the Montreal Protocol banned most ozone depleters, a catastrophic global menace has begun to recede.