Environmental Science for AP* (2nd Edition)

Published by W. H. Freeman
ISBN 10: 1464108684
ISBN 13: 978-1-46410-868-6

Chapter 15 - Module 46 - Major Air Pollutants and Their Sources - AP Review Questions - Page 527: 4

Answer

(a)

Work Step by Step

$PM_{2.5}$ (particles with a diameter $\leq 2.5$ micrometers) pose the greatest health concern because they can penetrate deep into the lungs and even enter the bloodstream, causing respiratory and cardiovascular problems. The answer is (a).
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