Group contribution model for determination of molecular diffusivity of non-electrolyte organic compounds in air at ambient conditions

► A Group Contribution model is proposed to determine the molecular diffusivity of organic compounds. ► 4661 non-electrolyte organic compounds are investigated to propose a predictive model. ► The AAD of the results from the corresponding experimental values is 1.4% and the R2 is 0.995. ► The model is also able to determine the probable doubtful experimental data.