Assertion: acetaldehyde | /r/HasProperty | detected in all 55 samples
Facets:
value: during 1992
type: TEMPORAL
value: at concentrations
type: OTHER
value: during 1991
type: TEMPORAL
Source sentences:
text: In a study in Windsor, Ontario, during 1991 and 1992, acetaldehyde was detected in all 55 samples collected, at concentrations ranging from 0.2 to 9 µg/m3; the overall mean concentration was 2.4 µg/m3 (OMEE, 1994a,b).