Which of the following statements is true about the troposphere?

The troposphere is indeed where weather and most pollution occur. This layer of the atmosphere, which extends from the Earth's surface up to about 8 to 15 kilometers (5 to 9 miles) high, is characterized by a significant amount of moisture and a variety of weather phenomena, including clouds, storms, and precipitation. The presence of water vapor is crucial, as it contributes to the formation of weather systems and influences climate patterns.

In addition to weather, the troposphere is where human activities contribute to pollution, making it the layer most affected by pollutants such as carbon monoxide, sulfur dioxide, and particulate matter. This connection to weather and pollution is integral to understanding how the troposphere plays a vital role in our daily environmental experiences and its impact on air quality and climate.

The other options do not accurately describe characteristics of the troposphere. For instance, it is not the highest layer of the atmosphere; that title belongs to the exosphere. The troposphere is also not devoid of moisture or weather systems; rather, it is rich in both. Furthermore, the ozone layer is primarily found in the stratosphere, not the troposphere, where it serves to absorb harmful ultraviolet radiation from the sun.