The study looked at pollutants washed off from a railway station during storms to understand their characteristics. They found that pollutant concentrations decreased as the storm went on. For example, the average concentration of suspended solids was 88.5mg/L, chemical oxygen demand was 174mg/L, and oil & grease was 12.5mg/L. Metal pollutants like copper, lead, and zinc were also present in varying amounts. The researchers suggest that controlling 50% of pollutant emissions during the first 30% of the storm flow could help manage pollution better.