______ is not a major air pollution

Explanation

Air pollution is the presence of harmful substances in the air that we breathe. The question is asking which of the options listed is not a major air pollutant. The options listed are carbon monoxide, ozone, oxygen, sulphur dioxide, and hydrogen. Carbon monoxide is a poisonous gas produced by incomplete combustion of fuels. It reduces the amount of oxygen in the bloodstream and can cause headaches, dizziness, confusion, and even death. Ozone is a gas that is formed from a chemical reaction between nitrogen oxides and volatile organic compounds in the presence of sunlight. It is a major component of photochemical smog and can cause respiratory problems. Sulphur dioxide is produced by burning fossil fuels and is a major contributor to acid rain. It can cause respiratory problems and can also harm plants and animals. Hydrogen is not a major air pollutant and is actually an important component of water. The correct answer to the question is option C, oxygen. Oxygen is not considered a major air pollutant as it is necessary for the survival of most living organisms. It makes up about 21% of the Earth's atmosphere and is required for respiration. However, excessive amounts of oxygen can also be harmful and can lead to oxidative stress and damage to cells. In summary, the correct answer to the question is option C, oxygen, as it is not considered a major air pollutant. Carbon monoxide, ozone, and sulphur dioxide are all major air pollutants that can cause harm to living organisms and the environment. Hydrogen is not a major air pollutant and is actually an important component of water.