The article discusses how urban stormwater runoff in Beijing contributes to water pollution. Researchers used monitoring data to estimate the total pollutant loads from the city. They developed a model to calculate the main pollutants in the runoff. The study found that the flush process affects both the quantity and quality of stormwater. By comparing point-source and non-point source pollutants, the researchers provided a scientific basis for managing urban stormwater pollution and improving infrastructure.