62. Which are the most abundant gases in the atmosphere?
a. oxygen and neon
b. nitrogen and oxygen
c. carbon dioxide and nitrogen
d. oxygen, carbon dioxide and helium
63. The atmospheric layer in which is found the air we breathe is
a. troposphere
b. mesophere
c. stratosphere
d. thermosphere
64. Which substance would be present in the greatest concentration during the morning
rush hour around 7am on a smoggy day in Los Angeles?
a. NO
b. O3
c. NO2
d. SO3
65. Which is the secondary pollutant in photochemical smog?
a. sulfur dioxide
b. nitrogen
c. hydrocarbon
d. ozone
66. When coal and fuel oil are burned, what two primary pollutants are formed?
a. SO2 and CO2
b. HNO3 and H2SO4
c. CO and O3
d. hydrocarbons and NO2
67. Which oxide of nitrogen is produced by lightning, forest fires, and internal
combustion engines?
a. N2O
b. NO2
c. NO
d. N2O5
68. Which of the following is not considered an air pollutant?
a. water vapor
b. ozone
c. nitric oxide
d. sulfur dioxide
69. A secondary pollutant
a. is less destructive than a primary pollutant
b. causes destruction on buildings but not on human beings
c. is produced by chemical reactions in the air
d. has a shorter lifetime in the atmosphere than that of a primary pollutant
70. The primary source of carbon monoxide (CO) is
a. the automobile
b. any burning process in the presence of a plentiful supply of air
c. from carbon dioxide
d. electrical power plants
71. Which of the following is not necessary for a thermal inversion?
a. an enclosed section of land where lateral movement of air is hindered
b. an abundant supply of SO2
c. a layer of colder air beneath a layer of warmer air
d. an absence of rain or other precipitation
Winter Smog: a high concentration of fine particles in the ambient air during the
winter months. This particulate matter accumulates at the ground level under
special temperature condition such as really cold temperature, low wind and
temperature inversion which have for effect to retain pollutants at ground level for
many hours.
72. What brown oxide of nitrogen is a necessary component of photochemical smog?
a. NO
b. NO2
c. NO3
d. N2O5
73. Why is carbon monoxide toxic to mammals?
a. it acts as a neurotoxin
b. inhibits oxygen binding to hemoglobin
c. causes restriction of the airway
d. it is very addictive
74. Which atmospheric region contains the protective ozone layer?
a. troposphere b. mesosphere
c. stratosphere
d. thermosphere
75. Which source is responsible for the greatest NOx emissions in the United States?
a. lightning
b. biomass burning
c. fossil fuel combustion
d. microbial activity in soil
76. Which is not a practical way to control hydrocarbon emissions?
a. design spouts on gasoline pumps to prevent gasoline leaks
b. use catalytic converters in automobiles
c. install an oxygen sensor in car engines
d. cut down trees emitting hydrocarbons in the atmosphere
77. The primary source of global SO2 in the atmosphere is believed to be
a. forest fires
b. human activity
c. volcanoes
d. forests
78. Which chemical would be most likely to react with sulfur dioxide and remove it from
combustion gases?
a. NO, nitric oxide
b. NaCl, salt
c. CaO, lime
d. HNO3, nitric acid
81. Major particulate/aerosol emissions come from
a. volcanic eruptions b. nitrogen fixation c. acid rain
d. home heating
82. Which pollutant is related to the following sources: sea salt, automobile and truck
exhaust, volcanoes, electric power plants?
a. lead
b. sulfur dioxide c. carbon monoxide d. particulates
83. Sulfur dioxide is given off by burning
a. some coal
b. some petroleum
c. some wood
d. all of the above