What PM2.5 means for health

There was a time when a clear blue sky in Beijing felt like a fleeting miracle, a spectacle you had to capture before it vanished. Today, clean air is no longer a rare event. It is an expectation, documented by data and defined by policy. This fundamental change reveals a powerful truth: even the most daunting urban environmental challenges can be reversed with sustained commitment. On the show: Niu Honglin, Steve & Yushan