虽然空气污染和化学物质被确认为是主要的威胁，但我们的分析认定，旅游业也是一个无声的杀手。
While air pollution and chemicals are believed to pose a major threat, our analysis determined that tourism served as the silent killer.
我们需要清新的空气，但遗憾的是，空气污染普遍存在，在城市中尤其如此。 [分析] 本句为了避免“尤其是在城市里”的表达不完整，增加了“如此”。
We need clean air, but unfortunately, air pollution is generally present, especially in cities。
据专家分析，城市空气污染70%以上是由汽车造成的。
According to experts' analysis, more than 70% of air pollution in cities results from autos.
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