Participatory health impact assessment used to support decision-making in waste management planning: A replicable experience from Italy.

•Public policy on waste needs of public participation since its planning phase.•The Local Agenda 21 approach within an HIA for the waste policy planning was performed.•The environment, health and socioeconomic impacts assessment involved the stakeholders.•A structured methodology within forum and focus groups provided good support in HIA.•Participatory HIA fostered sustainable and transparent waste management policy.