First, setting off firecrackers made a tremendous noise and caused serious air pollution.
首先，放鞭炮制造巨大的噪音，造成了严重的空气污染。
Was noise pollution a serious problem before the closing of the old factory?
旧工厂关闭之前噪音污染是个严重的问题吗？
Because air, water, and noise pollution has become more and more serious.
因为空气，水和噪声等污染已经变得越来越严重了。
Noise pollution now is a serious environment problem.
现在噪音污染是个严重的环境问题。
Noise pollution now is a serious environment problem.
现在噪音污染是个严重的环境问题。
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