One of these days; a few thousand Richard Dreyfuss types are going to remove their masks...
There is nothing wrong with the air...
https://www.bing.com/videos/search?q=close+encounters+of+the+third+kind+mask+scene&docid=608030496844745973&mid=8255AF85B0DE8C3BCDCF8255AF85B0DE8C3BCDCF&view=detail&FORM=VIRE