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What is implied about ozone gas based on the passage?

  1. Ozone is the result of pollution.

  2. High ozone levels in the atmosphere will cause large numbers of people to buy new car batteries.

  3. Ozone is harmless and inert.

  4. Ozone has a sharp odor and is used for various purposes.

The correct answer is: Ozone has a sharp odor and is used for various purposes.

Ozone is often described as having a distinctive sharp odor, which is recognizable, especially after thunderstorms or near electrical equipment. This quality suggests its presence in the environment, often linked to certain industrial activities or natural processes. Additionally, ozone has various applications, such as in water treatment and disinfection, highlighting its usefulness beyond just being a mere component of the atmosphere. The correct choice reflects these characteristics of ozone gas, establishing its olfactory presence and functional roles in various contexts.