The speed of sound in air has really nothing to do with the sea level and its atmospheric pressure.
Speed of sound is dependent on the temperature.
Look at the link: "Speed of Sound in Air and the effective Temperature".
The average air pressure at sea level is around 101.3 kilopascals (kPa).
Normal air pressure is greatest at sea level, where it is typically around 1013 millibars or 29.92 inches of mercury. As you go higher in elevation, air pressure decreases.
At sea level, air has a density of approximately 1.2 kg/m3.
The weight of air at sea level is approximately 0.075 pounds per cubic foot. One cubic yard is equal to 27 cubic feet, so the weight of air per cubic yard at sea level would be approximately 2.025 pounds.
Air pressure at sea level typically weighs around 14.7 pounds per square inch (psi), or around 101.3 kilopascals (kPa). This is the standard atmospheric pressure at sea level.
The velocity of sound in air at sea level at normal temperature and pressure is 3.4329 metres/second.
Do you mean speed of sound at sea level? Scroll down to related links and look at "Speed of sound - temperature matters, not air pressure".
Sea level pressure, sometimes as mean sea level pressure.
sea level
The air pressure is greatest at sea level.
Below sea level atmospheric pressure increases with depth. Air pressure at sea level is about 14.7 psia. Air pressure below sea level would be slightly higher.
The terminal velocity of a falling human (including a baby) at sea level is approximately 120 mph (193 km/h). At this speed, air resistance balances out the force of gravity, leading to a constant velocity. It is also worth noting that other factors, such as air pressure and body position, can influence the terminal velocity.
Sea level pressure.
Sea level
At sea level
About 186,000 miles per second at sea level.
The average air pressure at sea level is around 101.3 kilopascals (kPa).