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City planners increasingly use noise maps to —identifyidentityidentifiedidentifying which neighbourhoods suffer the greatest exposure to traffic and industrial sound. These colour-coded maps —combinecombinescombinedcombining decibel readings collected from sensors placed across the urban area. Councils then use the data to —decidedecisiondecidingdecided where sound barriers or quiet zones might be most —beneficialbenefitbeneficiallybenefiting.