concern. >> this methane concern one of the unknown health risks from the oil spill. fox news health.com senior managing editor dr. manny alvarez collected it out for himself in grand isle, louisiana. >> hey, guys. i'm here in louisiana. this is a beach that, of course, has been contaminated with oil. this is an area where a lot of workers are working around the clock to make the cleanup right behind the sand dunes here is what they call the hot zone. that's still -- you know, those are piles of sand contaminated with oil and, of course, this is -- you cannot go in there because of the possible toxic effects not only from the oil but all the chemicals they're using for the cleanup which is a main concern for many hospitals in the area. you can smell -- you can literally smell the oil and whatever toxic fumes in this air but the concerns from the citizens, of course, is not only the smell and the toxicity that they're getting from it but also, now we're very concerned about the workers. you know, multiple hospitals in the area have set up tents. they have set up decontamination