A polar vortex is a large pocket of very cold air, typically the coldest air in the Northern Hemisphere, which sits over the polar region during the winter season.
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45.What is green chemistry?
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46.
Define environmental chemistry ?
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47.
What is environmental pollution? What are the main causes of pollution?
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48.
What is the difference between pollutant and contaminant?
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49.
Define the following terms: (i) Source (ii) Sink (iii) Receptor.
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50.
What do you understand by air pollution? Discuss the types of air pollutants.
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