 It might be a little intuitive to think of it this way. So I think we've all been downwind from a smell we don't like. Think about being downwind from a smoker, for example, if you're not a smoker. And that can have an effect on our quality of life. Now, amplify that by like tens of thousands. And that's what air pollution is doing between states. Each state is responsible for reaching certain goals that are set in collaboration with EPA. But if the state next door is dumping a bunch of their air pollution or a bunch of their air pollution is flowing to you because of wind currents...