What happens to air pressure after a front passes?

After a front passes, there is typically a change in air pressure that can lead to an increase in pressure. This is because when a cold front moves in, it often replaces warmer, less dense air. As this colder air moves in, the atmospheric pressure can rise due to the sinking of the denser, cooler air, which can result in clearer skies and improved weather conditions.

Conversely, if a warm front passes, air pressure initially might decrease as the warm air rises and expands; however, the eventual stabilization and settling of the air can lead to a gradual increase in pressure afterward. This general trend highlights the atmospheric dynamics involved in front passages.

In summary, the increase in air pressure can be attributed to the behavioral changes in air masses associated with the passing of a front, making it the most suitable answer to the question.