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Table 1 Effects of H2S at various concentrations

From: Japanese experience of hydrogen sulfide: the suicide craze in 2008

Concentration of H2S, ppm Symptoms of exposure
0.05 Pungent smell mimicking "rotten egg"
0.1 Anosmia
50-150 Becoming paralyzed in a few minutes
250 Photophobia, lacrimation, rhinorrhea, cyanosis, pulmonary edema
250-500 Headache, nausea, vomiting, diarrhea, dizziness, palpitation, tachycardia, hypotension, muscle fasciculation, muscle weakness, apnea, disorientation, coma
500-750 Respiratory arrest within 30 to 60 min
750-1000 Collapsing momentarily or knocked down
>1000 Dying immediately within a breath