Air Pollution 101 | National Geographic

What is the primary source of most air pollution?

• Volcanic eruptions

• Wildfires

• Human activities

• Allergens

What is the main effect of greenhouse gases in Earth's atmosphere?

• They cool the atmosphere.

• They trap heat from the sun.

• They increase visibility.

• They reduce pollen production.

Smog is categorized into which two main types?

• Carbon and Nitrogen

• Sulfurous and Photochemical

• Natural and Artificial

• Visible and Invisible

Which of the following is a health problem that can be caused by toxic air pollutants?

• Improved vision

• Stronger immune system

• Cancer

• Increased energy levels