During breathing cycle what is the advantages of residual volume of air in lungs

During breathing cycle, the residual volume of air in lungs provide the advantage as it prevents the lungs from collapsing. Also, due to the presence of residual volume, there is sufficient time for oxygen to be absorbed and for the carbon dioxide to be released during breathing.

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sulfur dioxide

explanation: acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. these substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.