Why does India report only half the plastic waste it generates every year?

The CPCB has approached the National Green Tribunal (NGT) to enforce the implementation of plastic waste management rules by non-compliant states

Only 14 of India’s 35 regional pollution boards filed information on plastic waste generation in 2017-18, according to the latest report of the Central Pollution Control Board (CPCB). Thus, the CPCB estimate of plastic waste generated in India in 2017-18--660,787.85 tonnes, enough to fill 66,079 trucks at 10 tonnes a truck--does not reflect the situation in more than 60% of India’s states and union territories.

In 2016-17 too, CPCB received these figures from only 25 regional pollution boards. The total plastic waste generation figure for that year was estimated at 1.6