EMMA BATHA SINGAPORE, Helsinki and Zurich are the world's smartest cities, according to an index published, amid a growing debate on the future of urban design for a post-COVID era. From smart traffic cameras and car sharing apps to pollution monitoring and free wifi for all, cities around the world are racing to embrace technology, but researchers said the real test was whether citizens felt the benefits. "The world's 'smart' cities don't simply adopt new technology, they make sure it truly improves citizens' lives," said Arturo Bris of the Swiss-based International Institute for Management Development (IMD), which published the index.…