Abstract: The present invention relates to an air purifier (1) comprising a body (2) having an air inlet (I) through which the air in the environment is sucked and a clean air outlet (O) through which the cleaned air is released to the environment, a first CO2 sensor (10) which is disposed at the air inlet (I) and a second CO2 sensor (11) which is disposed at the clean air outlet (O), a CO2 adsorption unit (3) which chemically adsorbs the carbon dioxide in the air by supplying a basic solution, a pump (4) which delivers the ambient air to the CO2 adsorption unit (3) through the air inlet (I), abase tank (8) which supplies the basic solution to the CO2 adsorption unit (3), an acid tank (7) wherein the air of which the carbon dioxide is adsorbed is treated with an acidic solution, and an electrodialysis unit (5) which separates the salt components formed after the ambient air is treated with the basic solution and the acidic solution into acid and base.