Houses built during the last ten years have been found to contain indoor air pollution at levels that are, on average, much higher than the levels found in older houses. The reason air-pollution levels are higher in the newer houses is that many such houses are built near the sites of old waste dumps or where automobile emissions are heavy.
Which of the following, if true, calls into question the explanation above?

Question

Examsnet · Accepted Answer

Correct Answer is :  New houses built in secluded rural areas are relatively free of air pollutants.

GMAT Verbal Reasoning Practice Test 5