Justify the statement: "Dust is a pollutant".

Write any two uses of carbon dioxide gas.

$(a)$ Name the two forms of oxygen found in the atmosphere.
$(b)$ Write the biotic and abiotic components of our environment.

List any three human activities that you think would lead to air pollution.

How is our atmosphere different from the atmospheres on Venus and Mars?

It is observed that the number of asthmatic patients is increasing day by day. It is due to urbanization,industrialization,and excessive use of vehicles. Sidak's mother took some initiatives to reduce this problem. She,along with her son and his friends,prepared data on the destinations colony people visit,the different routes taken,and the timings of their jobs,and arranged for carpooling.
$(a)$ Explain the reason for the growing number of asthmatic patients.
$(b)$ Explain the values shown by Sidak's mother.
$(c)$ Suggest other methods to reduce this problem.