Assertion: hydrogen sulfide's odor | /r/HasProperty | detected by human
Facets:
value: often
type: TEMPORAL
Source sentences:
text: Fortunately, that threshold is below the lethal limit of many aquatic organisms (usually above 5 ppb; sometimes as high as 50,000 ppb), so odor often can be detected by humans before hydrogen sulfide rises to acute, lethal concentrations in reef aquaria.