Pollution is most severe in urban areas when
A) a cold upper-level low moves into a region.
B) a warm front passes through the area.
C) a large slow-moving anticyclone moves into an area.
D) a storm system begins developing to the west.
E) a cold front passes through the area.

Question

Quizplus · Accepted Answer

When a large slow-moving anticyclone moves into an area, the air becomes stagnant and traps pollutants close to the ground. This can result in high levels of pollution in urban areas. The other choices do not necessarily contribute to severe pollution in urban areas.

Pollution Is Most Severe in Urban Areas When