It's not about making them healthier out there. It's about mitigating the problems brought on by spreading 15 million people throughout the LA area where everyone drives everywhere they go polluting the hell out of the air. All in a place with no natural water sources. They need to overregulate and conserve to survive, not as a goody two shoes we're saving the world kind of way. They may try to put that mask on it to make it seem less like, "We F'd up royally over the last 60 years, now you're all going to pay dearly for our poor planning. Enjoy the freeways!!"