Fewer pollutants and their harmful effects on the human body

Carbon monoxide:

Prevents blood from carrying oxygen; causes headaches and dizziness, and even death if inhaled in large doses.

Hydrocarbons:

Have a bad smell and can cause liver damage and cancer

Sulphur dioxide and oxide of nitrogen:

Harm the respiratory system, dissolve in rain forming sulphuric acid and nitric acid, respectively. They cause acid rain which damages trees, crops and buildings.

Chlorofluorocarbons:

Cause thinning of the ozone layer. This results in more ultraviolet rays reaching the earth. Ultraviolet rays harm our eyes and skin.

Smoke:

Harms the respiratory system. The lead present in automobile exhausts can cause brain damage, especially in children. Smoke reduces visibility and forms smog, which affects the climate.

Dust:

Injures the respiratory system and the eyes. It causes diseases like bronchitis and asthma.