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The troposphere is the lowest level of the atmosphere, so it is in contact with the Earth’s surface. In contrast, the stratosphere is located above the troposphere, so it is not in contact with the Earth’s surface.
Humans live in the troposphere, not the stratosphere. The only time people spend time in the stratosphere is when they are traveling on a high-altitude airplane, or flying through it while riding in a rocket.
The air density and air pressure are much lower in the stratosphere. In fact, the air is too thin in the stratosphere for people to be able to survive without pressurized air to breathe.
On average, the troposphere is warmer than the stratosphere.
Meteorological weather primarily occurs in the troposphere and does not occur in the stratosphere. For example, it only rains and snows in the troposphere. Also, the clouds you see in the sky are all located in the troposphere (with the exception of polar stratospheric clouds which only occur in the winter near the Earth’s poles).
There are differences between tropospheric and stratospheric chemistry. For example, the ozone layer only occurs in the stratosphere. Also, smog and surface level pollution only occur in the troposphere. Additionally, the concentration of stratospheric water vapor, i.e., humidity, is always very low; in contrast, tropospheric humidity can vary quite a bit from very high humidities in the tropics and low humidities in the polar regions.
The tropospause is a narrow boundary that separates the stratosphere from the troposphere whereas statospause is a narrow boundary that separates the mesosphere from the stratosphere.