Towards a Clear Sky was the theme of our 2018 program. We visited three cities in the Asia Pacific region in various stages of their development, all having radically different relationships with ̶ and approaches to ̶ air. From Delhi to Melbourne to Hong Kong, our global conversation connected those who share a passion for delivering tomorrow’s cities. Ensuring clean, safe air is one of the most critical challenges to get right for people and our planet in the 21st century.