The answer is A - Ozone Layer.
Volatile Organic Compounds are found in almost everything from underarm deodorant, paints and finishes to freshly baked cake. Since the beginning, VOCs have been a major concern to Environmental Protection Agency and air quality boards across Europe and the United states. Ozone which helps block the block the sun from ultraviolet radiation, can be good or bad. It occurs both in the Earth’s upper atmosphere and at ground level. Bad ozone is where most VOCs play a significant role through reactions between oxides of nitrogen and VOCs.
