求翻译：人们曾一度认为，大气污染只会影响到拥有工厂或者交通拥挤的大城市。如今，我们知道尽管这些地区是大气污染最严重的地区，但实际上这个问题是全球性的。事实上，全球的气候都可能受到大气污染的影响。是什么意思？

People once thought that air pollution only affects have factories or traffic congestion in cities. Today, we know that even though these areas is the most serious regional air pollution, but in fact this problem is global. In fact, the global climate are likely to be the impact of air pollution.

It has been thought that air pollution will affect only the traffic congestion at the factory or major cities. Today, we know that even though these areas are the most serious air pollution the area, but in fact this problem is global. In fact, the global climate are likely to be affected by air pol

The people once believed that, the air pollution only can affect to has the factory or the traffic congestion big city.Now, although we know these areas are the air pollution most serious area, but in fact this question is global.In fact, the global climate all possibly receives the air pollution th

It was once believed that, air pollution would affect only large cities with factories or traffic congestion. Now, we know that while air pollution in these areas are the most affected areas, but in fact this problem is a global one. The fact that the global climate could be under the influence of a

正在翻译，请等待...