Health is basic need of our life, if you are healthy you can do any activity you want, you can attend your class, go to job, do your business and travel etc. If you're sick or having any type disease you cannot do anything. As you said air pollution is causing problems, discussing oxides.

• SO2 mixes with rain water and by reaction they form H2SO4, a sulfuric acid which is the main reason behind skin cancer and other face problems.
• industrial waste contaminate drinking water and you are going to get other diseases, like typhoid and hepatitis.

Thank You