NCERT Solutions for Class 8 Science Chapter 18: Pollution of Air and Water

In this chapter, we will read about air and water pollution. We read about the constituents of air and how it is getting polluted. We also learn about how the air gets polluted. We read about the different concentration of pollutants in the air and their impact on the environment. We also read about the greenhouse effect and greenhouse gases. The chapter also gives solutions to curb air pollution and we also read about water pollution and its effects on the environment. The chapter also talks about potable water and how water is purified. It concludes by telling us ways to curb water pollution.

• The chapter begins by telling us about the concentration of different particles in the air.
• When the level of unwanted substances in the air rises, it is known as air pollution.
• We learn about air pollutants and the respiratory disease they cause.
• We also read about chlorofluorocarbons that damage the ozone layer.
• The chapter takes the example of the Taj Mahal and how it has been affected by air pollution.
• The radiation by the earth’s atmosphere is called the greenhouse effect.
• The chapter also tells us about the various greenhouse gases in our atmosphere.
• We also learn about various ways to curb the greenhouse effect.
• For example, the Delhi government’s decision to switch to CNG instead of petroleum and diesel.
• Pollutants are those substances that pollute water bodies.
• The chapter takes the example of river Ganga and how it has been polluted over the years.
• We read about the Ganga Action Plan and what it seeks to achieve.
• Water which is suitable for drinking is called potable water.
• We also learn techniques which purifies water and ways to keep the water clean.
• Calls for stricter industrial measures to be implemented have also been made.
• The principle to reduce, reuse, and recycle can also be used to keep water bodies clean.