Don't Miss a Beat: how Cities@Heart and its partners marked World Heart Day 2026 World Heart Day (29 September) is a global moment to raise awareness of cardiovascular disease (CVD), the world's leading cause of death. This year, partners across the Cities@Heart consortium marked the day with a webinar in Belfast, a public campaign in İzmir, and a Dress Red Day in Utrecht, alongside a week-long online campaign from the project. Why World Heart Day