7.4 - Atmospheric CO2 and Particulates

Forest fires naturally release all of the following EXCEPT:

• Carbon monoxide

• Sulfur dioxide

• Particulate matter

• Carbon dioxide

Plants naturally emit which type of air pollutant?

• Particulate matter

• Sulfur dioxide

• VOCs

• Carbon monoxide

Volcanoes are natural sources of all the following air pollutants EXCEPT:

• Sulfur dioxide

• Nitrogen oxides

• Particulate matter

• VOCs

Which natural process releases carbon dioxide, but is NOT considered a major contributor to atmospheric CO₂?

• Respiration

• Volcanic eruptions

• Forest fires

• Soil erosion

The term "haze" refers to:

• A buildup of nitrogen oxides

• Particulate matter reducing visibility

• Formation of photochemical smog

• Chemical reactions forming sulfuric acid

What gas is primarily produced during anaerobic decomposition?

• Carbon dioxide

• Methane

• Nitrogen

• Ozone

PM10 refers to particulate matter that is

• 10 centimeters or smaller

• 10 micrometers or smaller

• 0.1 micrometers or smaller

• 2.5 micrometers or smaller

Which is the main health concern with PM2.5 particles?

• They cannot be inhaled at all

• They embed deeply in the lung tissue

• They dissolve immediately in the bloodstream

• They are easily filtered by nose hairs