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BEIJING: A gas blow-out in southwest China turned an area of 25 square km into a death zone, killing nearly 200 people in their sleep or outside their homes, a government official and state media said today.
link.
"Sulphurated hydrogen" as they refer to it is Hydrogen Sulphide, or H2S. Commonly known as 'rotten egg gas'. At low concentrations, it causes nausea, but at higher concentrations it destroys your ability to smell it - these people affected probably didn't even smell it coming. It only take a few hundred PPM to be fatal.