All but one of the 100 cities with the world’s worst air pollution last year were in Asia, according to a new report from IQAir. Climate change is playing a pivotal role in bad air quality that is risking the health of billions of people worldwide. Host Marco Werman speaks with Glory Dolphin Hammes, CEO of IQAir North America, about her company’s latest pollution index, and what it tells us about progress in cleaning up the air we breathe.