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This paper proposes an optimized wavelet transform Hausdorff multivariate grey model (OWTHGM (1, N)) that addresses some of the weaknesses of the conventional GM (1, N) model such as inaccurate prediction and poor stability. Three improvements have been made: First, all inputs are filtered using a wavelet transform; second, a new time response function is established using the Hausdorff derivative; and finally, the use of Rao's algorithm to optimise the model's parameters as well as the ξ-order accumulated value of the observation data described by the Hausdorff derivative. In order to demonstrate the effectiveness of OWTHGM (1, N), it is applied to predict CO 2 emissions from road fuel combustion. The new model scores 1.27% MAPE and 79.983 RMSE, and is therefore more accurate than competing models. OWTHGM (1, N) could therefore serve a reliable forecasting tool and used to monitor the evolution …