Why air quality is getting worse in many places and how it puts human health at risk

While the U.S. has made great progress improving air quality in recent decades, air pollution is still a driver of many serious health conditions both domestically and globally. According to a new report, only seven countries met the World Health Organization’s air quality guidelines for pollution in 2023. Glory Dolphin Hammes, North American CEO for IQAir, joins William Brangham to discuss.