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Which of the following is not a source of ozone emission in the atmosphere?
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A metal is exposed to the atmosphere for sometime. It becomes coated with green carbonate. The metal must be
Choose the word that best completes the sentence : Noise pollution generally receives less attention than ----- air pollution.
Air pollution caused by industrial fumes "has" been studied for years, "but " only recently "has" the harmful effects of noise pollution "become" known.