 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 because specifically because of the geography there with the angeles crest mountains which holds in you know because of the basin yeah because of the basin i mean it just it's a basin it holds the air in place and so anything that goes up is pretty much going to stay right there it doesn't get blown around and dispersed