Status of road traffic noise in Calcutta metropolis, India

Road traffic noise was measured at 24 traffic junctions of Calcutta, India during the summer of 1993, with the simultaneous recording of the number of vehicles passing. The A-weighted values of Leq(24), Ldn, L10, L90, L99, Lnp and TNI were determined. Statistical regression equations of Leq(h) were developed as a function of logarithm of the equivalent number of light/heavy vehicles per hour for the entire city and for zones within the city.