Which of the following is not a indoor air pollutant?
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
Carbon monoxide
Nitrous oxide
Radon
Mercury
Environment and health