Consider the following statements with respect to effects of air pollutants on human health and identify the INCORRECT statement.
1
Inhalation of lead can cause mental retardation and behavioural disorders.
2
Sulphur dioxide can cause cancer and mutations and it is radioactive in nature.
3
Nitrogen dioxide irritates the lungs and can cause bronchitis and pneumonia.
4
Inhalation of carbon monoxide leads to reduction in the amount of oxygen delivered to organs and tissues.