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The Central Pollution Control Board (CPCB) has identified certain industries as heavily polluting industries. These industries are known to have a significant impact on the environment and contribute to pollution. The question asks for the option that is not identified as a heavily polluting industry by the CPCB.
1. Pulp and Paper: This industry is known for its high water consumption and discharge of pollutants such as organic matter, suspended solids, and chemicals. It is identified as a heavily polluting industry by the CPCB.
2. Sugar: The sugar industry is known for its water-intensive operations and the discharge of pollutants like organic matter, suspended solids, and high levels of biochemical oxygen demand (BOD). It is also identified as a heavily polluting industry by the CPCB.
3. Tea: This industry is not identified as a heavily polluting industry by the CPCB. Tea processing typically involves drying and packaging operations, which do not contribute significantly to pollution.
4. Fertilizer: The fertilizer industry, especially those involved in the production of chemical fertilizers, is known for potential air, water, and soil pollution. It is identified as a heavily polluting industry by the CPCB.
Therefore, the correct answer is option 3 - Tea.