Which of the following statements about air pressure is true?

Air pressure is highest at sea level due to the weight of the atmosphere pressing down from above. The atmosphere is composed of layers of air, and as altitude increases, there is less air above to exert pressure. Consequently, the density of air decreases with elevation, resulting in lower air pressure at higher altitudes. This phenomenon is fundamentally based on the gravitational pull on the air molecules and is observed consistently in the Earth's atmosphere.

For example, at sea level, we experience air pressure around 1013 hPa (hectopascals), whereas at higher elevations such as in mountainous regions, the pressure can drop significantly. This relationship between altitude and air pressure is crucial for understanding weather patterns, breathing at different elevations, and various atmospheric phenomena. The assertion that air pressure remains constant across all altitudes or that it only decreases in winter contradicts established scientific understanding, as well as the fact that air pressure will vary continuously with changes in altitude and atmospheric conditions.