Which of the following gases is beneficial in the upper atmosphere because it blocks ultraviolet (UV) radiation from reaching the ground but is harmful near ground level because it causes respiratory problems in humans?

Rationale

Ozone is beneficial in the upper atmosphere because it blocks ultraviolet (UV) radiation from reaching the ground but is harmful near ground level because it causes respiratory problems in humans.

Ozone in the stratosphere plays a critical role in absorbing harmful UV radiation, protecting living organisms on Earth. However, at ground level, ozone becomes a pollutant that can trigger respiratory issues and other health problems.

A (Carbon monoxide) YOUR ANSWER

Carbon monoxide is a colorless, odorless gas that is primarily produced from burning fossil fuels. While it poses serious health risks when inhaled, it does not absorb UV radiation and therefore does not play a protective role in the atmosphere. Instead, it can lead to poisoning and cardiovascular issues.

B (Nitrogen) YOUR ANSWER

Nitrogen makes up about 78% of the Earth's atmosphere and is inert under most conditions. It does not absorb UV radiation or contribute to the formation of ozone, meaning it has no beneficial effects regarding UV protection. Additionally, nitrogen is not harmful to human health at typical atmospheric concentrations.

C (Ozone) CORRECT

Ozone's unique molecular structure allows it to absorb UV radiation effectively, providing a shield against harmful sunlight in the stratosphere. However, when ozone is found at ground level, it is a major component of smog and can lead to serious respiratory issues, making it a dual-natured gas that is both beneficial and harmful depending on its location.

D (Radon) YOUR ANSWER

Radon is a radioactive noble gas that can accumulate in buildings, particularly in basements. While it poses serious health risks due to its radioactive properties, it does not interact with UV radiation in the atmosphere. Thus, it does not have any protective effect against UV radiation.

Conclusion

Ozone serves a crucial dual role in our atmosphere: it protects us from UV radiation in the upper atmosphere while posing health risks at ground level. This complexity highlights the importance of understanding how different gases interact with environmental factors and human health, underscoring the need for effective air quality management.

Which of the following gases is beneficial in the upper atmosphere because it blocks ultraviolet (UV) radiation from reaching the ground but is harmful near ground level because it causes respiratory problems in humans?

Ozone is beneficial in the upper atmosphere because it blocks ultraviolet (UV) radiation from reaching the ground but is harmful near ground level because it causes respiratory problems in humans.

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