Question

which is a major source of human - created air pollution?
○ industrial factories
○ hydroelectric dams
○ reforestation projects
○ wind farms

Explanation:

To determine the major source of human - created air pollution, we analyze each option:

• Industrial factories: Industrial activities in factories often involve burning fossil fuels, emitting pollutants like sulfur dioxide, nitrogen oxides, and particulate matter. This makes them a significant contributor to air pollution.
• Hydroelectric dams: These are used for generating clean energy. They do not produce air pollutants during normal operation as they rely on water flow to generate electricity.
• Reforestation projects: Reforestation is an environmental - friendly activity. Trees absorb carbon dioxide and release oxygen, helping to improve air quality rather than polluting it.
• Wind farms: Wind farms generate electricity using wind energy, which is a clean and renewable source. They do not emit air pollutants.

Answer:

A. Industrial factories