Of the following which one pollutes the air of a big city ? A. Copper B. Chromium C. Lead D. Calcium

The correct answer is: C. Lead.

Lead is a heavy metal that is toxic to humans and other animals. It can be found in the air, water, soil, and food. Lead pollution can cause a variety of health problems, including brain damage, learning disabilities, and reproductive problems.

Lead is released into the environment from a variety of sources, including:

• Gasoline: Lead was used as an additive in gasoline until it was banned in the United States in 1996. However, lead from gasoline can still be found in the environment, especially in areas where older cars are still used.
• Paint: Lead was used in paint until it was banned in the United States
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  in 1978. Lead paint can still be found in older homes and buildings.
• Smelting: Lead is a byproduct of smelting, which is the process of extracting metals from ores. Lead smelters can release lead into the air and water.
• Batteries: Lead is used in batteries. When batteries are disposed of improperly, lead can be released into the environment.

Lead pollution can be prevented by:

• Reducing the use of lead in products: Lead should not be used in gasoline, paint, or other products.
• Properly disposing of lead products: Lead products should be disposed of properly, not in landfills or incinerators.
• Reducing exposure to lead: People should avoid exposure to lead, especially children and pregnant women.

If you are concerned about lead pollution, you can contact your local health department for more information.