 instituted a lot of air quality controls that focused on particulates. And they did do a pretty good job. That was about car emissions. It was about industrial emissions. There was all sorts of different things. As you said, there was a lot of technology involved in this. And they improved matters greatly. Now, the smog is still there in Los Angeles. There's reasons for that, specifically because of the geography there with the Angeles Crest Mountains, which holds in