The exhaust from our cars pollutes the air and causes asthma in children.

我们汽车排放的废气会污染空气，使幼童罹患气喘。

There is no safe level of secondhand smoke exposure which can cause a number of health problems, including asthma in children.

二手烟暴露并没有安全限值，它会引发很多的健康问题，包括儿童哮喘。

A growing concern was that this could be causing asthma in children.

人们越来越担心这可能会导致儿童哮喘。