Some researchers suggest that the increase in the number of children suffering from asthma over the last two decades is caused by __________.

Question

Quizplus · Accepted Answer

Some researchers have suggested that exposure to "asthma triggers," such as dust, may be increasing because new buildings are more weatherproof, and therefore less drafty, than old ones, and consequently the flow of air within them is more restricted.

Some Researchers Suggest That the Increase in the Number of Children