Datasheet

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4. Reference
 350~450 ppm: General outdoor environment
 350~1000 ppm：The air is fresh and breathing smooth
 1000~2000 ppm：The air was stagnant and feel asleep
 2000~5000 ppm：headache, asleep, dull, unable To Focus, heart beat rock and even mild
nausea
 >5000 ppm：severe depletion of oxygen, permanent brain damage and even death