Which of the following is not a indoor air pollutant?: (A) Carbon monoxide, (B) Nitrous oxide, (C) Radon, (D) Mercury
Answer is D. Major air pollutants from indoor sources include carbon monoxide, polycyclic aromatic hydrocarbons, nitrogen oxides, sulphur oxides, arsenic and fluoride and radon. Park's Textbook of Preventive and Social Medicine, 25th edition, Page No. 796