The Clean Air Act aims to reduce emissions of which of the following to improve air quality?

The Clean Air Act aims to reduce emissions of which of the following to improve air quality?

• A. Nitrogen gas
• B. Sulfur compounds
• C. Carbon monoxide
• D. Water vapor

Answer: (B)

The main idea is that the Clean Air Act targets pollutants that degrade air quality and harm health, REGULATING those emissions to improve the air people breathe. Sulfur compounds, especially sulfur dioxide and related sulfates, are a major pollutant class because they come from burning fossil fuels and form fine particulate matter and acid rain. These pollutants directly affect respiratory health, visibility, and ecosystems, so reducing sulfur compounds has a clear and broad impact on improving air quality. Nitrogen gas is a major, harmless component of air, so it isn’t something the act aims to reduce. Water vapor fluctuates naturally and isn’t treated as a controllable pollutant under the act. Carbon monoxide is indeed harmful and regulated, but the option focusing on sulfur compounds best captures the pollutant group most closely tied to the act’s broad air-quality improvements.

The main idea is that the Clean Air Act targets pollutants that degrade air quality and harm health, REGULATING those emissions to improve the air people breathe. Sulfur compounds, especially sulfur dioxide and related sulfates, are a major pollutant class because they come from burning fossil fuels and form fine particulate matter and acid rain. These pollutants directly affect respiratory health, visibility, and ecosystems, so reducing sulfur compounds has a clear and broad impact on improving air quality. Nitrogen gas is a major, harmless component of air, so it isn’t something the act aims to reduce. Water vapor fluctuates naturally and isn’t treated as a controllable pollutant under the act. Carbon monoxide is indeed harmful and regulated, but the option focusing on sulfur compounds best captures the pollutant group most closely tied to the act’s broad air-quality improvements.