Explanation:

Pollution Control Board The Central Pollution Control Board:

=> CPCB is a statutory organisation which was constituted in 1974 under the Water (Prevention and Control of Pollution) Act, 1974.

=> It's duty is to minimise environmental pollution.

=> It has been given some more powers under Air (Prevention and Control of Pollution) Act, 1981 and Environment (Protection) Act, 1986.

=> Section 4 of Water (Prevention and Control of Pollution) Act, 1974 mandated for State level pollution control board in every state.

=> Following this Pollution Control Board of Assam has been established.