Q510
The first case of severe air pollution in modern times was
A.
In the Meuse valley of Belgium
AnswerB.
A killing smog in Donara, Pennsylvania along the Monongahela river
C.
"Episode 104" which blanketed all or part of 22 states east of the Mississippi
D.
The deadlier smog in London in which 4,000 to 5,000 people died from respiratory failure
Answer: Option A
Solution
Answer: Option A
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