Amid a row over use of loudspeakers at religious places, the Mumbai police have requested automobile manufacturers to lower the sound limit of vehicle horns, in accordance with the Supreme Court's directions on noise pollution, an official said.

Currently, the volume of vehicle horns is in the range of 92 to 112 decibels, which violates the apex court's guidelines, he said. "We recently held a meeting with various automobile manufactures and asked them to reduce the sound of vehicles horns in order to check the noise pollution," he said.