The most common cause of pollution of air is A. Carbon dioxide B. Carbon monoxide C. Sulphur dioxide D. Smoke

The correct answer is: D. Smoke

Smoke is a mixture of solid particles and gases that are released into the air when something is burned. It can be caused by a variety of sources, including wildfires, industrial emissions, and cigarette smoke. Smoke can contain a variety of harmful pollutants, including particulate matter, carbon monoxide, and volatile organic compounds. These pollutants can cause a variety of health problems, including respiratory problems, heart disease, and cancer.

Carbon dioxide is a gas that is released into the atmosphere when fossil fuels are burned. It is also a natural part of the Earth’s atmosphere. However, human activities have increased the levels of carbon dioxide in the atmosphere, which

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