Air pressure decreases with altitude in the Earth's atmosphere. This means that air pressure is higher near the Earth's surface and decreases as you go higher up into the atmosphere. The atmospheric pressure at the Earth's surface is higher compared to the pressure at higher altitudes.
Atmospheric pressure is caused by the weight of the air above a certain point in the atmosphere. As you move higher in the atmosphere, there is less air above you, which means there is less weight pressing down and causing pressure. This is why atmospheric pressure decreases with increasing altitude.
The highest atmospheric pressure is typically found at sea level, near the Earth's surface. As you go higher in altitude, such as climbing a mountain or flying in an airplane, atmospheric pressure decreases. This decrease in pressure has various effects on the behavior of gases, weather patterns, and human physiology. For instance, as you ascend to higher altitudes, the lower atmospheric pressure can lead to reduced oxygen levels, which can affect breathing and require acclimatization.
In summary, air pressure is higher at the Earth's surface compared to higher altitudes, and atmospheric pressure decreases as you move upwards in the Earth's atmosphere.
The strength of air pressure is maximum at the earth's surface because due to higher strength of gravitational pull large numbers of atmospheric gases come closer to each other and form a denser layer, so due to formation of this denser layer the air pressure increases over the earth surface. The pressure exerted by the air in the atmosphere is greatest at Earth's surface and falls as altitude increases. The reason is that density and depth of the atmosphere are greatest at sea level and decline with increasing altitude. What this implies is that atmospheric pressure decreases with increasing height. Since most of the atmosphere's molecules are held close to the earth's surface by the force of gravity, air pressure decreases rapidly at first, then more slowly at higher levels. The gravitational attraction between the earth and air molecules is greater for those molecules nearer to earth than those further away they have more weight dragging them closer together and increasing the pressure between them.Atmospheric pressure is not the same everywhere on Earth. Atmospheric pressure depends on the altitude of your location. Many places on Earth are at sea level, which has an atmospheric pressure of 1 kilogram per square centimeter. Pressure varies from day to day at the Earth's surface - the bottom of the atmosphere. This is, in part, because the Earth is not equally heated by the Sun. Areas where the air is warmed often have lower pressure because the warm air rises. These areas are called low pressure systems. What this implies is that atmospheric pressure decreases with increasing height. Since most of the atmosphere's molecules are held close to the earth's surface by the force of gravity, air pressure decreases rapidly at first, then more slowly at higher levels. The depth (distance from top to bottom) of the atmosphere is greatest at sea level and decreases at higher altitudes. With greater depth of the atmosphere, more air is pressing down from above. Therefore, air pressure is greatest at sea level and falls with increasing altitude.I t is more dense near the earth. It goes on thinning out as we go up. So, there being more density of air near the earth, there is more air pressure. As the density of air goes on decreasing, its weight and consequently the air pressure goes on decreasing with increase of height.