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04-05-2024
Chemistry

Answered

What has been the trend of major air pollutants (lead, particulate matter, SO₂) in the past 15 years in the United States?
A. The concentration of these major air pollutants has increased
B. The concentration of these major air pollutants has decreased
C. The concentration of these major air pollutants has stayed the same
D. There is no data to indicate any trends in the concentration of air pollution

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