The main cause of ozone depletion and the ozone hole is manufactured chemicals, especially manufactured halocarbon refrigerants, solvents, propellants, and foam- blowing agents (chlorofluorocarbons (CFCs), HCFCs, halons).Sep 16, 2020
How do humans cause ozone depletion?
Human activities cause the emission of halogen source gases that contain chlorine and bromine atoms. These emissions into the atmosphere ultimately lead to stratospheric ozone depletion. The source gases that con- tain only carbon, chlorine, and fluorine are called “chlo- rofluorocarbons,” usually abbreviated as CFCs.
What human activities increase ozone in the atmosphere?
Combustion of fossil fuels in motor vehicles and in stationary power plants has led to increases in nitrogen oxides and volatile organics emissions into our troposphere. Interacting together in sunlight, nitrogen oxides and hydrocarbons are causing increases in tropospheric ozone.
What are the 4 causes of ozone depletion?
The main reasons for the ozone hole are chlorofluorocarbons, carbon tetrachloride, methyl bromide and hydrochlorofluorocarbons.
Which human activity would most likely contribute to ozone layer destruction?
Human emissions of chlorine- and bromine-containing gases have increased substantially since the middle of the 20th century (see Q16). The result has been global ozone depletion with the greatest losses occurring in polar regions (see Q11 to Q13).
How might humans and animals be impacted by ozone depletion?
Humans and Animals The cellular damage that UV rays can impose has major health implications, such as skin cancer, the formation of cataracts, blindness, and a weak immune system.
What emissions from human activities lead to ozone depletion and what are the principal steps in stratospheric ozone depletion caused by human activities?
The stratospheric ozone depletion process begins with the emission of halogen source gases by human activities and natural processes. Those emitted by human activities are also called ozone-depleting substances (ODSs). Subsequent steps are accumulation, transport, conversion, chemical reaction, and removal.
What are the effects of ozone depletion on humans and plants?
Ozone layer depletion causes increased UV radiation levels at the Earth's surface, which is damaging to human health. Negative effects include increases in certain types of skin cancers, eye cataracts and immune deficiency disorders.
How does ozone depletion affect human life?
Ozone depletion can cause increased amounts of UV radiation to reach the Earth which can lead to more cases of skin cancer, cataracts, and impaired immune systems. Too much exposure to UV is believed to be contributing to the increase in melanoma, the most fatal of all skin cancers.
What is the main reason for ozone depletion Mcq?
Manufactured chemicals, precisely manufactured halocarbon solvents, refrigerants, foam-blowing agents, and propellants are the ozone-depleting substances or ODS, known to be the main cause of depletion of the ozone layer.