71. What is the name of the atmospheric layer that contains the ozone layer?
a) Troposphere
b) Stratosphere
c) Mesosphere
d) Thermosphere
72. Which of the following is a common source of outdoor air pollution?
a) Industrial emissions
b) Motor vehicle emissions
c) Tobacco smoke
d) Radon
73. What is the name of the atmospheric layer that contains the auroras?
a) Troposphere
b) Stratosphere
c) Mesosphere
d) Thermosphere
74. Which of the following is a common indoor air pollutant that can cause headaches, nausea, and dizziness?
a) Carbon monoxide
b) Nitrogen dioxide
c) Carbon dioxide
d) Methane
75. What is the name of the atmospheric layer that contains the highest concentration of ozone?
a) Troposphere
b) Stratosphere
c) Mesosphere
d) Thermosphere
