The Kolkata Municipal Corporation (KMC) along with city police and Paschimbanga Vijnanan Mancha will observe no horn hour from 11am to 12 noon on 5 June to observe World Environment Day. The move is aimed at sensitising people about noise pollution and its after effect. It may be recalled that a recent survey has shown that many drivers of heavy duty vehicles are becoming deaf because of rampant use to air horn. KMC will request VIPs not to use hooters during the hour. Only Ambulance will be exempted. n SNS