The researchers studied the water quality of Lake Gulshan in Dhaka, Bangladesh, to understand pollution sources. They found low oxygen levels and high pollution indicators, like BOD and nutrients, threatening aquatic life. The lake's water quality is poor due to industrial effluents and municipal waste. The study used statistical analysis to identify four main pollution sources, with municipal wastewater being the primary cause in the dry season and surface runoff in the wet season. The findings highlight the urgent need to address pollution in Lake Gulshan to protect public health and the environment.