Air pollution is the introduction into the gentle wind of chemicals, particu latish matter, or biological materials that cause discomfort, disease, or death to humans, victimize other living organisms such as food crops, or damage the natural environment or built environment. The atmosphere is a complex dynamic natural gaseous system that is essential to support life on planet Earth. Stratospheric ozone depletion cod to air pollution has long been recognized as a threat to human health as well as to the Earths ecosystems.
Ozone Depletion
Ozone depletion describes two distinct but related phenomena notice since the late 1970s: a steady decline of about 4% per decade in the total volume of ozone in Earths stratosphere (the ozone floor), and a much larger springtime decrease in stratospheric ozone all over Earths polar regions. The latter phenomenon is referred to as the ozone hole. In addition to these long-familiar stratospheric phenomena, there atomic number 18 also springtime polar tropospheric ozone.
Causes
The details of polar ozone hole formation differ from that of mid-latitude thinning, but the close important process in both is catalytic devastation of ozone by atomic halogens.
[1] The main source of these halogen atoms in the stratosphere is photodissociation of synthetic halocarbon refrigerants (CFCs, freons, halons). These compounds are transported into the stratosphere after being emitted at the surface. [2] Both types of ozone depletion were observed to increase as emissions of halo-carbons increased.
Effects
Since the ozone layer absorbs UVB ultraviolet light from the sun, ozone layer depletion is expected to increase surface UVB levels, which could moderate to damage, including increase in skin cancer. This was the reason for the Montreal Protocol. Although decreases in stratospheric ozone are well-tied to CFCs and there are good theoretical reasons to believe that decreases in ozone will lead to increases in surface UVB, there is no direct...If you want to blend a full essay, order it on our website: Ordercustompaper.com
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