________ is most dangerous to human health.
A) Nitrogen dioxide
B) Gross particulates such as dust and soot
C) Fine particulates and micro fibers
D) Pollens and spores

Question

Quizplus · Accepted Answer

Fine particulates and micro fibers, which are smaller than 2.5 micrometers in diameter, can penetrate deep into the lungs and can cause respiratory and cardiovascular problems, including lung cancer, heart attacks, and strokes. Nitrogen dioxide, gross particulates, pollens, and spores can also pose health risks, but fine particulates and micro fibers are considered the most dangerous.

________ Is Most Dangerous to Human Health