Odour thresholds

ODOUR THRESHOLD The minimum concentration of a substance at which the majority of test subjects can detect and identify the substance s characteristic odour. 

Some materials possess low odour thresholds their smell gives warning of impending danger. Others possess odour thresholds well in excess of the hygiene standard. Examples are included in Table 5.12. 

Published odour threshold values vary widely from source to source. 

Beeause of the odour threshold of ea 0.015 ppm, exposure to ozone below the TLV ean usually be deteeted by smell. 

Some materials with low odour thresholds may paralyse the olfactory nerves and cause the sense of smelt to be lost within minutes (e.g. hydrogen sulphide). 

Occupational Exposure Limit (OEL), 81, 82, 111 Occupational Exposure Standard (OES), 16, 112 Odour threshold, 16, 82, 118 Olefins, 35... 

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