Spherical shaped Barium titanate (BaTiO3) nanospheres was synthesized, using co‐precipitate technique. The as‐synthesized nanospheres was discovered to be discriminatory in terms of sensing carbon dioxide (CO2) gas. The structural parameters like, shape, optical properties, morphology, and thermal stability were explored using XRD, FT‐IR, UV‐Visible, EDS and FE‐SEM. Spherical shaped BaTiO3 nanospheres material have the highest response (63 %) for CO2 gas. CO2 gas reaction and recovery times were 23.5 and 20.3 seconds, respectively. The CO2 gas concentration climbs from 1 to 50 ppm, reaction to gas sensors increases. CO2 gas has higher selectivity for BaTiO3 nanospheres as compared to other gases like carbon dioxide (CO2), methane (CH4), carbon monoxide (CO), nitric oxide (NO), hydrogen sulphide (H2S) and hydrogen (H2). The repeatability of BaTiO3 nanospheres was researched for 42 days and discovered to be impressive.