Final answer:
An inversion layer traps air pollution close to the ground and suppresses convection, leading to the accumulation of air pollutants.
Step-by-step explanation:
An inversion layer occurs when a certain weather pattern traps cooler air near the surface of the earth with a warmer air mass above it. This can be a problem because it traps air pollution, such as smog, close to the ground. The inversion also suppresses convection, which can lead to the accumulation of air pollutants.