April 20, 2017: Hour 2

In hour two of Here & Now's April 20, 2017 full broadcast, we talk with Sir John Sawers, former head of the British Secret Intelligence Service MI6, about navigating security threats around the world. Also, despite improvements California cities still top the list of those with the country’s worst air pollution. Paul Billings of the American Lung Association joins us to discuss. And how much exercise is safe during pregnancy? For answers, we check in with Dr. Jessica Shepherd, a professor of obstetrics and gynecology at the University of Illinois Chicago. You can read and hear more at hereandnow.org, follow us on Twitter and join the conversation on Facebook and Tumblr.