Which of the following statements BEST describes what air pollution is?

• Air pollution is a pollutant that is emitted directly from a source.
• Air pollution is the chemicals and particles in the atmosphere that poses serious threat to human health and environment.
• Air pollution is all the gases that surround Earth.
• Air pollution is a pollutant that is formed when a primary pollutant interacts with each other in the atmosphere.

Check ALL the NATURAL sources of air pollution.

• volcanic eruptions
• burning of fossil rules
• wildfires
• burning of trash

Check ALL the HUAMN sources of air pollution.

• volcanic eruptions
• burning of fossil fuels

• wildfires
• burning of trash

Which of the following statements BEST describes what the atmosphere is?

• The atmosphere is a pollutant that is emitted directly from a source.
• The atmosphere is the chemicals and particles in the atmosphere that poses serious threat to human health and environment.
• The atmosphere is all the gases that surround Earth.
• The atmosphere is a pollutant that is formed when a primary pollutant interacts with each other in the atmosphere.

Select the percentage of the atmosphere NITROGEN makes up.

• 78%
• 21%
• Less than 2%

Select the percentage of the atmosphere OXYGEN makes up.

• 78%
• 21%
• Less than 2%

Select the percentage of the atmosphere TRACE GASES makes up.

• 78%
• 21%
• Less than 2%

Which of the following statements BEST describes what a TRACE GAS is?

• A trace gas is a pollutant that is emitted directly from a source.
• A trace gas is the chemicals and particles in the atmosphere that poses serious threat to human health and environment.
• A trace gas is a pollutant that is formed when a primary pollutant interacts with each other in the atmosphere.
• A trace gas is a gas that makes up less than 2% of the atmosphere.

Which of the following statements BEST describes what a PRIMARY POLLUTANT is?

• A primary pollutant is a pollutant that is emitted directly from a source.
• A primary pollutant is all the gases that surround the Earth.
• A primary pollutant is a pollutant that is formed when a primary pollutant interacts with each other in the atmosphere.
• A primary pollutant is a gas that makes up less than 2% of the atmosphere.

Which of the following statements BEST describes what a SECONDARY POLLUTANT is?

• A secondary pollutant is a pollutant that is emitted directly from a source.
• A secondary pollutant is all the gases that surround the Earth.
• A secondary pollutant is a pollutant that is formed when a primary pollutant interacts with each other in the atmosphere.
• A secondary pollutant is a gas that makes up less than 2% of the atmosphere.