Is it true that one of the most polluted stretches of the river Ganga is at Kanpur in Uttar Pradesh? 

The given statement is true.

The pollution of the Ganga in Kanpur is a result of several factors, including untreated sewage, industrial effluents, and solid waste disposal.

Kanpur is an important industrial city, and many industries are located along the banks of the river. These industries discharge untreated or partially treated effluents directly into the river, which contributes to pollution. Additionally, the city's sewage treatment infrastructure is inadequate and outdated, resulting in the discharge of untreated sewage into the river.

The pollution of the Ganga in Kanpur has a significant impact on the river's ecosystem and the health of people who rely on it for drinking water and irrigation. The contaminated water can cause several water-borne diseases, including cholera, typhoid, and hepatitis A.

The Indian government has launched several initiatives to address the pollution of the Ganga, including the Namami Gange programme, which aims to clean and rejuvenate the river. However, the pollution of the Ganga in Kanpur and other parts of the river basin remains a significant challenge, and concerted efforts are needed to ensure the river's long-term health and sustainability.