Accurate accounting of atmospheric environmental capacity is beneficial for optimising industrial structure and revealing the development potential of industrial park, but it is difficult to achieve accurate prediction with a single model. To address this issue, taking an industrial park in Chongqing as an example, a smoke integral multi-dimensional multi-box model was constructed based on the environmental parameters collected in the park, and the atmospheric environmental capacity of the industrial park was evaluated. Results indicate that the atmospheric environmental capacity calculated by the model generally exceeds the current pollutant emissions, confirming that there remains potential for further development in the park, even with existing pollutant emission controls. The discrepancies between the model's results and those derived from the modified A-value method are minimal, demonstrating the reliability and accuracy of the smoke integral multi-dimensional multi-box model, thus it is shown that this method can be effectively applied to the calculation of atmospheric environmental capacity. Finally, by combining the calculation results with the current pollutant emission characteristics of the park, optimization suggestions are provided for the planning and development of the industrial park.