air quickly, you can be perfectly fine. it really depends on how much you breathe in. listen to the press conferences. it seems like they are more dealing with the results of the explosion, not so much the results of the gas inhalation. >> the debris and the material that exploded. >> that's right. >> causing serious physical harm to a lot of people. but not necessarily the gas. not over with by any means. >> no, it isn't. we don't know how much this gas has dissipated. so the explosion itself, burns some of it up, which is a good thing. and wind can take it away, and certain temperature situations can make it dissipate. we don't know how long the gas hung out for. people were exposed to high concentrations. it can be instantly dangerous. even if not instantly dangerous, it can cause lung irritation, ear, nose, throat, eye irritation. >> what is the treatment? how do you deal with that?