In order to understand human impact on the environment, scientists need to monitor the levels of many substances. Which substance should be monitored and controlled to help minimize the impact of human activity on air quality? A. Oxygen B. Ozone C. Water vapor D. Nitrogen



Answer :

Answer:

To minimize the impact of human activity on air quality, scientists should monitor and control the levels of **B. Ozone**.

Ozone at ground level (tropospheric ozone) is a significant air pollutant that can have harmful effects on human health, vegetation, and the climate. It is formed by chemical reactions between nitrogen oxides (NOx) and volatile organic compounds (VOCs) in the presence of sunlight. Ground-level ozone is a key component of smog and can cause respiratory problems, aggravate asthma, and reduce lung function.

While the other substances listed—oxygen, water vapor, and nitrogen—are essential components of the Earth's atmosphere and not pollutants in themselves, it is the elevated levels of ozone at the surface that are particularly problematic for air quality. Therefore, controlling and monitoring ozone levels is crucial for reducing the negative impact of human activity on air quality.

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