A system and method for enhancement of CO2 concentration in closed or semi closed spaces, wherein said system comprises a unit (3) for capturing CO2 from ambient air, said unit further comprises two process units (134, 172) capable of 5 adsorbing and desorbing CO2 on an adsorbent, and working alternately in adsorbing and desorbing mode.A system and method for enhancement of CCh concentration in closed or semi closed spaces, wherein said system comprises a unit (3) forcapturing CCh from ambient air, said unit further comprises two process units (134, 172) capable of adsorbing and desorbing CCh on an adsorbent, and working alternately in adsorbing and desorbing mode.
