What is the air density of the Mesosphere?

The air density in the mesosphere, which extends from about 50 to 85 kilometers (31 to 53 miles) above the Earth's surface, decreases with altitude. At the lower boundary, the density is approximately 0.01 kg/m³ and can drop to about 0.001 kg/m³ near the mesosphere's upper limits. This low density is due to the decreasing pressure and temperature as altitude increases in this layer of the atmosphere.