由於近年來空氣汙染的問題日趨嚴重：汽機車排放的廢棄及空氣中的灰塵，都造

由於近年來空氣汙染的問題日趨嚴重：汽機車排放的廢棄及空氣中的灰塵，都造成了衛生上的一大疑慮。

結果 (英文) 1:

In recent years the increasingly serious problem of air pollution: waste and airborne dust emissions from motor vehicles, have caused a great concern on health.

結果 (英文) 2:

As air pollution problems have become more serious in recent years: waste from motor vehicles and dust in the air have created a major health concern.

結果 (英文) 3:

In recent years, the problem of air pollution has become more and more serious: the waste of locomotives and the dust in the air have caused a big health concern.