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The sense of smell is unreliable as an indicator of exposure.

Some hazardous materials have no smell. Some can be smelled only at concentrations well above levels that are unacceptable for exposure. Others can be smelled at extremely low levels where there is no hazard, so relying on smell for those materials would result in inappropriate alarm.

Finally, the nose can become fatigued, so that you cease to smell something that you could at first readily detect. As a result, you may believe the agent has gone away, when it is still there but you can no longer smell it.

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15y ago

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