Description : Which of the following is usually not an air-pollutant? (1) Hydrocarbons (2) Sulphur dioxide (3) Carbon dioxide (4) Nitrous oxide
Last Answer : (4) Nitrous oxide Explanation: The six air pollutants are carbon monoxide, lead, ground-level ozone, nitrogen dioxide, particulate matter, and sulfur dioxide. The combustion of gasoline and other ... as laughing gas, is used in surgery and dentistry for its an-aesthetic and analgesic effects.