(i) Polluted water should be treated before draining in rivers.
(ii) Reduction of smoke by using oil and gas instead of coal.
(iii) Use of hydel power.
(iv) Use of machinery which reduce noise.
(v) Solid waste like fly ash, phospo-gypsum and iron and steel slags should be treaded before open dump.

For more answers visit to website:
https://www.tiwariacademy.com/ncert-solutions/class-10/social-science/