81. Which one of the following metals pollutes the air of a city having large number of automobiles?
82. Pollutant from motor car exhaust that causes mental disease is
83. The most common cause of pollution of air is
84. Particulates (< 1 µm size) remaining suspended in air indefinitely and transported by wind currents are called
85. Mercury is emitted into air by
86. 'Acid rain' is caused due to air pollution by
87. Gas released during Bhopal tragedy was :
88. The filter over which sewage is sprinkled is called as
89. Main source of lead pollution is from
90. An example of major air pollutant is
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