The suppression of the inhibition effect by SO2 sulfur dioxide with the simultaneous action of two activators - P2O5 phosphorus oxide and NxOy nitrogen oxide, the process of carbon dioxide absorption by chlorophyll-synthesizing microalgae Chlorella had been studied in this work. Experimental dependences of the СО2 uptake dynamics by microalgae under the conditions of the SO2 inhibitor critical concentration action and the simultaneous presence of P2O5 and NxOy activators have been shown. A mathematical description of the Chlorella microalgae biomass growth depending on the P2O5 and NxOy activators concentration, provided that there is a SO2 inhibitor constant concentration has been obtained. The optimum values of the P2O5 phosphorus oxide and NxOy nitrogen oxides concentration at the SO2 inhibitor critical concentration for the carbon dioxide absorption by chlorophyll-synthesizing microalgae Chlorella process have been established.