CO₂ content in soil air is

Solution (By Examveda Team)

Soil gas is also the mixture of all types of gases found in the air space between soil components, if they do not contain water, are filled with air.
Soil air contains 0.25% of Carbon dioxide much more than its percentage in the atmosphere which is only 0.04%. As we know plants breathe out carbon dioxide which makes its percentage higher near their horizon.