Why is the problem of the densely populated area more suffering?

The densely populated area are suffering greatly with the problem of cleanliness. The weaker group of society along with the children and the old, who have poor resistance are suffering from diseases. The main reason behind polluting the environment is the poor control of waste. This is because the people in these areas do not have proper access to the waste disposal system. This has led to the contamination of drinking water, food chain, and the water used for bathing and other purposes.