Which of these was most responsible for increased air pollution in the West during the 1950s and 1960s?

Name: Which of these was most responsible for increased air pollution in the West during the 1950s and 1960s?
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The population boom in the West during the 1950s and 1960s led to increased industrial activity, more vehicles on the road, and greater energy consumption, all of which contributed significantly to increased air pollution during that period.

Which of These Was Most Responsible for Increased Air Pollution