Assertion: hydrogen sulfide | /r/HasProperty | detected in 2 of 12 air samples
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Source sentences:
text: In 2015, hydrogen sulfide was detected in 2 of 12 air samples (each collected in a different month over a 24-hour period) from a smelt-dissolving tank stack at a kraft pulp mill in British Columbia, at concentrations of 47.51 ppb (66.51 μg/m3) and 121.75 ppb (170.44 μg/m3) (British Columbia 2015).