NASA | Imported Dust in American Skies

What surprising discovery was made about the origin of aerosols above North America?

• Aerosols do not affect air quality.

• Most aerosols are man-made.

• Half of the aerosols come from foreign sources.

• All aerosols are from local sources.

Why is it important to focus on local pollution control despite foreign aerosols?

• Local pollution has no impact on health.

• Foreign aerosols are high in the atmosphere and less likely to be inhaled.

• Local pollution is not a concern.

• Foreign aerosols are more harmful.

How can aerosols affect weather patterns?

• By reducing sunlight.

• By seeding clouds and altering precipitation.

• By increasing greenhouse gases.

• By cooling the Earth's core.

What is one potential environmental impact of dust and soot particles on snow?

• They make snow more reflective.

• They cause snow to melt faster.

• They increase snowfall.

• They have no effect on snow.

What is the overall message regarding global air quality?

• Each country is isolated in its air quality issues.

• Air quality is not a global concern.

• We share one atmosphere, and every country affects others.

• Only industrial countries affect global air quality.