Accurate estimation of atmospheric environmental capacity is essential for optimizing industrial structure and assessing the development potential of industrial parks; however, single models often lack predictive accuracy. To address this issue, this study develops a smoke-integral multi-dimensional multi-box model based on site-specific environmental parameters and applies it to an industrial park in Chongqing. Results indicate that the calculated atmospheric environmental capacity exceeds current pollutant emissions, confirming potential for further development under existing emission controls. Comparison with the modified A-value method demonstrates minimal discrepancies, revealing the reliability and accuracy of the proposed model. Furthermore, by combining model results with current emission characteristics, targeted optimization strategies for industrial park planning and development are proposed.