More than five million people die every year from pollution-related illnesses, and nearly 10,000 of those deaths occur in London. But Romain LaCombe has made it his mission to change that. To do so, LaCombe—the London-based CEO of Plume Labs—has designed a system to help us understand more about the air we breathe. And he did it in the most unconventional way imaginable: using pigeons ... with tiny backpacks. This is a mission for the pigeon air patrol.