Recently a Delhi-based non-profit Toxic Link stated that the Ganga is heavily polluted with microplastics at Varanasi, Haridwar and Kanpur. 

Microplastics are plastics that are less than 5 millimetres in size but are a major source of marine pollution. They are non-degradable plastics. 

Some examples are, 

• Polyacetylene is used as a doping agent in the electronics industry. 
• Polypropylene is also used in packaging, plastic sheets, fibre, fabrics, rope, etc. 
• PIP is mainly used in footwear and baby bottle nipples. 
• Polyamide, commonly known as nylon, is used as a natural fibre and as metal wires in clothing and industry. 

Source: Down To Earth