What does ambient air refer to?

Ambient air refers to the air that exists in the outdoor environment, which is exterior to buildings. This terminology highlights the concept of air quality and pollution levels in the open atmosphere that surrounds us, rather than confined or controlled environments like indoor spaces.

The correct choice emphasizes the importance of understanding the natural air conditions outside structures, which can significantly influence indoor air quality and the health of occupants. Knowledge about ambient air is crucial for addressing environmental concerns and implementing strategies that promote healthy urban living and mitigate the effects of pollution on human health.

In contrast, other choices mention indoor air quality or imply a controlled environment, which does not accurately represent the definition of ambient air. The focus on exterior air makes option B the most accurate representation of the term.