Given the task definition and input, reply with output. Given a scientific passage and an answer, generate a question for the given answer.

Passage: The ozone in smog may damage plants. The effects of ozone add up over time. Plants such as trees, which normally live a long time, are most affected. Entire forests may die out if ozone levels are very high. Other plants, including crop plants, may also be damaged by ozone. You can see evidence of ozone damage in Figure below . Answer: ozone
What is the term for the gas in smog that can damage plants?