Assertion: acetaldehyde | /r/HasProperty | detected in all 11 samples of ambient air
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Source sentences:
text: Acetaldehyde was also detected in all 11 samples of ambient air collected during 1993 from residential and industrial areas of Hamilton, Ontario; the mean concentration was 2.1 µg/m3, with levels ranging from approximately 1.4 to 2.6 µg/m3