Tata Power on Friday said the Maharashtra Pollution Control Board (MPCB) has requested it to halve the particulate matter emissions from its generating unit here to help curb pollution. “MPCB has asked Tata Power to explore the feasibility of reducing the particulate matter from the stack from the present permissible 100 Mg/Nm3 to a more benign 50 Mg/Nm3,” a spokesperson for the power utility said.