Which odor is commonly associated with cyanide exposure?

Which odor is commonly associated with cyanide exposure?

• A. No odor
• B. Garlic
• C. Bitter almonds
• D. Rotten eggs

Answer: (C)

Cyanide exposure is traditionally described as having a bitter almond odor, a descriptor that appears in many toxicology and EMS references. This odor can serve as a helpful clue when it is detectable, but it isn’t universal because some people cannot perceive it due to genetic variation in smell receptors, and environmental conditions can mask it. Because absence of odor does not rule out exposure, it’s important to rely on clinical signs such as rapid onset of headache, confusion, shortness of breath, or seizures, rather than odor alone. The other scents—rotten eggs indicating hydrogen sulfide and garlic-like smells pointing to different toxins or exposures—do not fit cyanide as the characteristic odor. So, bitter almonds is the best answer for the commonly associated odor.

Cyanide exposure is traditionally described as having a bitter almond odor, a descriptor that appears in many toxicology and EMS references. This odor can serve as a helpful clue when it is detectable, but it isn’t universal because some people cannot perceive it due to genetic variation in smell receptors, and environmental conditions can mask it. Because absence of odor does not rule out exposure, it’s important to rely on clinical signs such as rapid onset of headache, confusion, shortness of breath, or seizures, rather than odor alone. The other scents—rotten eggs indicating hydrogen sulfide and garlic-like smells pointing to different toxins or exposures—do not fit cyanide as the characteristic odor. So, bitter almonds is the best answer for the commonly associated odor.