In which atmosphere layer does 80 percent of the gas in the amtosphere reside?

About 80 percent of the gas in the atmosphere resides in the troposphere, which is the lowest layer of Earth's atmosphere. This layer extends from the Earth's surface up to approximately 8 to 15 kilometers (5 to 9 miles) in altitude, depending on the location. It contains most of the atmosphere's water vapor and is where weather phenomena occur.