Mumbai, Nov. 20 -- Noise levels on the day of Diwali (November 14) dipped marginally in Mumbai as compared to the decibel levels recorded in the previous years of the festive day, the Maharashtra Pollution Control Board (MPCB) said. However, the pollution control body on Thursday also stated that the noise levels remained above the permissible limits on the festival, even as five locations witnessed 'poor' air....