56. Which of the following is a common secondary air pollutant that forms from the reaction of sulfur dioxide and nitrogen oxides in the atmosphere?
a) Ozone
b) Carbon monoxide
c) Nitrogen dioxide
d) Sulfuric acid
57. Which of the following is a natural source of air pollution?
a) Industrial emissions
b) Motor vehicle emissions
c) Volcanic eruptions
d) Cigarette smoke
58. What is the name of the atmospheric layer where the ozone layer is located?
a) Troposphere
b) Stratosphere
c) Mesosphere
d) Thermosphere
59. Which of the following is not a common greenhouse gas?
a) Carbon dioxide
b) Methane
c) Water vapor
d) Nitrogen
60. Which of the following is a common indoor air pollutant that can cause headaches, dizziness, and fatigue?
a) Carbon monoxide
b) Nitrogen dioxide
c) Carbon dioxide
d) Oxygen
