Question

The major man-made sources of air pollution are ____________.

• A. automobiles and industries
• B. burning of garbage
• C. brick kilns
• D. all of the above

Answer 1

Answer: (D)

• Automobiles and industries- Power plants, factories, cars and trucks emit carbon dioxide, carbon monoxide, hydrocarbons, sulfur dioxide, nitrogen dioxides and particulate matter that consists of fine particles suspended in the air. Burning oil, coal, gasoline and other fossil fuels is a major cause of man- made air pollution.
  
• burning of garbage - An estimated 40 to 50 percent of the garbage is made up of carbon by mass, which means that carbon dioxide is the major gas emitted by trash burning. Those emissions are dwarfed by others sources on the global scale, such as cars and power plants, amounting to just 5 percent of total global carbon dioxide emissions.
• brick kilns - Brick kilns emission consists of mainly fine particles of coal, dust particles, organic matters and small amount of gases such as SO2, NOx, H2S,CO etc. Which are one of the primary pollutants.
• The correct answer is D .