How much carbondyoxyde is in the air?

Answer 1

Carbon dioxide (CO2) is one of the major components of Earth\'s atmosphere making up about 0.04 percent (400 parts per million) of the air we breathe. It is also the most important of the "greenhouse gases" that regulate the temperature of our planet.

• In the troposphere (the atmospheric layer closest to the surface of the Earth) the average concentration of CO2 is about 400 ppm (parts per million).
• At higher elevations the concentration of CO2 decreases reaching a minimum of about 300 ppm in the stratosphere.
• At the highest levels of the atmosphere CO2 concentrations are much lower ranging from about 5 to 10 ppm.

CO2 concentrations are constantly fluctuating due to natural processes such as respiration and photosynthesis as well as human activities such as burning fossil fuels. As a result the concentration of CO2 in the atmosphere is constantly changing.

Answer 2

The concentration of carbon dioxide in the Earth's atmosphere is approximately 400 parts per million (ppm), which means that for every million air molecules, about 400 are carbon dioxide molecules.