(a)[3]
Fill in the table with the approximate percentage for each gas shown.
(b(i))[1]
Name a gas that is not listed in the table and would be found at a higher concentration in an industrial area than in the countryside.
(b(ii))[3]
Explain why this gas would be found at a high concentration in an industrial area.
(c)[4]
Suggest why industrial regions usually support fewer wildlife species than the countryside.