Wind can carry air pollutants up to ______ of miles away from their source.

Wind is a significant factor in the dispersion of air pollutants, and it has the capability to transport these pollutants over vast distances. The correct choice reflects the reality that under certain atmospheric conditions, such as high wind speeds and favorable weather patterns, pollutants can indeed be carried thousands of miles away from their original source. This phenomenon can occur with different types of pollutants, including particulate matter, gases, and aerosols, which can all be lifted into the atmosphere and conveyed across long distances.

The ability of wind to move pollutants over such large distances is critical for understanding air quality impacts. For instance, pollutants emitted in industrial areas can affect air quality in regions far away, influencing both human health and environmental conditions. Recognizing this transport mechanism is vital for assessing the broader impacts of air pollution and for formulating effective regulations and responses to protect air quality. This understanding helps clarify why monitoring and controlling emissions is important, not just locally, but also in a regional or even global context.