Wildfire smoke is dirtier than ever. Because of urban sprawl, synthetic materials are burning in fires and potentially harming the air that we breathe. And this isn’t just a local problem. Wildfire smoke can travel thousands of miles, riding the wind across continents and oceans, and changing along the way. With all these risks, it would be nice to do something to breathe easier. But we can’t live in a bubble. So what can people do with the air we’ve got?