What factor is least likely to influence the accumulation of air pollutants in a given area?

Tectonic activity at plate boundaries is least likely to influence the accumulation of air pollutants in a given area compared to the other factors listed. While tectonic activity can lead to geological changes and occasionally trigger events such as volcanic eruptions, which can release particulate matter and gases into the atmosphere, these occurrences are much less frequent and typically localized.

In contrast, population density significantly affects the accumulation of air pollutants because areas with higher populations typically have more vehicles, industrial activities, and energy usage, all contributing to higher emissions. Industrial activity directly contributes to air pollution through the release of various pollutants during manufacturing processes, thereby influencing the air quality in surrounding regions. Weather patterns also play a critical role in pollutant distribution; they can affect how pollutants disperse, react in the atmosphere, and accumulate in specific areas.

Therefore, while tectonic activity has some relevance to air quality under specific circumstances, it is not a consistent or direct factor like the others mentioned.