## 6 Conclusions  
This paper introduces two common methods for calculating a ship pollution emission inventory, proposes the engine propeller matching coefficient to modify the traditional power method, and refers to the research of domestic and foreign scholars and combines the characteristics of the ship activity level in the region to comprehensively determine the parameters of the calculation model. In the case of statistical comparison of the air pollutant emissions of the main and auxiliary engines under different navigation conditions, the uncertainty analysis was carried out, and the AIS combined with the power method was used to obtain the air pollution emission inventory of ships in the main urban area of Chongqing. For the traditional STEAM model, combined with the relevant regulations of the region, this paper introduces the fuel correction factor and the engine propeller matching coefficient to correct the traditional ship emission inventory calculation model. Establishing a reliable ship emission inventory is in line with the development trend of ship air pollution prevention and control strategies. Under the complex navigation environment of inland ships, it solves the problem that the calculation of pollutants caused by the hardware conditions of old ships does not match the actual situation. This provides industry researchers with new ideas to improve the accuracy of emission inventories and provides important methods and data support for the further improvement of ship emission inventories. In addition, the emission of air pollutants from ships will cause various harm to the health of residents, such as the impact of pollutants on respiratory diseases and immune function, inducing tumors and even death. The establishment of the ship's air pollutant emission inventory and the implementation of government prevention and control measures have improved the atmospheric environment of coastal people's lives and will further enhance their physical health. The establishment of a more accurate emission inventory is convenient for the environmental protection department to monitor and manage the seriously polluted ports, such as: promoting the access of ships to shore power and installing diesel engine purification equipment. With access to real-time AIS data, new energy replacement and other emission reduction measures will play a greater role in forecasting the effect. However, although the research in this paper can provide a reference for the prevention and control of air pollution from ships in the main urban area of Chongqing in the Yangtze River to a certain extent, the research still has certain limitations. At present, there are few domestic research results on the experimental measurement of inland waterway ship emission factors, and the authenticity is difficult to guarantee. Since emission factors are an important part of emission inventories, further emission testing is required to determine emission factors for ship engines that meet national conditions. For the old ships in inland rivers in the region, after testing the load power of the diesel engine, the engine propeller matching coefficient is determined to be 1.25, which is not universal. For newly built ships and ships with a higher degree of automation, further experiments are needed to determine the engine propeller matching coefficient. In addition, when calculating the monthly ship pollution discharge in the study area, this paper collects 5 days of ship activity data per month, calculates the daily emissions separately, and then multiplies the average value by the number of days per month to obtain the monthly ship pollution emissions. In order to make the calculated regional ship emissions more accurate, in the future, the ship activity data can be collected continuously and completely through Internet servers and other equipment to calculate a more reliable regional ship air pollution emission list. Conceptualization & Writing-Original Draft, Z.P. ; Writing--Review & Editing, L.W. ; Methodology, L.T. ; Formal analysis, C.Z.