HERE is accurate information:
At some threshold level, believed to average around 300350 ppm, the oxidative enzymes become overwhelmed. Many personal safety gas detectors, such as those used by utility, sewage and petrochemical workers, are set to alarm at as low as 5 to 10 ppm and to go into high alarm at 15 ppm."
Dude, I'm a chemist (PhD). I "know" about chemistry, and about the toxicity of chemicals. And I certainly know at least how to SPELL the words. NO American regulatory agency would mis-spell chemical names as are done in your post. Your source is bogus, as is the information contained therein. Not worth the electrons used to transmit it.
Fair enough. I am not a chemist so I'll respect your criticism, and assume that the Orlando Indep. Examiner isn't as reliable a source as an anonymous chemistry PhD on the Internet who calls himself "Wonder Warthog". Nor did I correct the spelling of the post components I cobbled together (that was just me being sloppy).
I hope you are correct.
I will, however, stand by the conclusions that I am an expert in, and restate that the catastrophic nature of this event is quite a bit beyond what people believe at the moment.
Including you.