Delhi - Delhi is one of the most polluted cities in the world, with high levels of air pollution caused by traffic and industry.
Kanpur - Kanpur is known for its leather industry, which generates high levels of pollution and waste.
Varanasi - Varanasi is a holy city on the banks of the Ganges river, but its water is heavily polluted due to industrial waste and sewage.
Patna - Patna suffers from high levels of air pollution and poor waste management practices.
Gaya - Gaya is a popular pilgrimage site, but its air and water are heavily polluted due to lack of waste management.
Faridabad - Faridabad is a major industrial hub near Delhi, and suffers from high levels of air pollution.
Raipur - Raipur is a rapidly developing city with high levels of industrial pollution and poor waste management.
Ludhiana - Ludhiana is a major industrial city in Punjab, known for its high levels of air and water pollution.