Explain how ozone being a deadly poison can still perform an essential function for our environment.

Explanation

### Step-by-Step Solution:

1. **Understanding Ozone**: Ozone (O₃) is a molecule composed of three oxygen atoms. It exists in different layers of the Earth's atmosphere, primarily in the stratosphere and troposphere.

2. **Ozone in the Stratosphere**: In the stratosphere, ozone plays a crucial role in protecting life on Earth. It absorbs the majority of the sun's harmful ultraviolet (UV) radiation. This function is essential for preventing skin cancer, cataracts, and other health issues in humans, as well as protecting ecosystems.

3. **Ozone in the Troposphere**: Conversely, ozone found in the troposphere (the lowest layer of the atmosphere) is considered a pollutant. It is formed when sunlight reacts with pollutants such as volatile organic compounds (VOCs) and nitrogen oxides. In this layer, ozone can be harmful to human health, causing respiratory problems and other health issues.

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