Question

In 3–5 sentences, explain the difference in good and bad atmospheric ozone and how each is distributed in Earth's atmosphere.(4 points)

Answer 1

“Good” ozone is the ozone layer in the stratosphere (roughly 10–50 km above Earth) that absorbs and blocks harmful ultraviolet (UV-B and UV-C) radiation, protecting life. It is formed when UV light splits O2 molecules and the freed oxygen atoms combine with O2 to make O3, so it is concentrated in a global ozone layer. “Bad” ozone is ground-level ozone in the troposphere (surface to ~10 km) and is a key component of smog that irritates lungs, damages vegetation, and worsens respiratory disease. It is produced by photochemical reactions of nitrogen oxides (NOx) and volatile organic compounds (VOCs) in sunlight, so concentrations are highest in sunny, polluted urban and downwind areas.