Related Clues:

• Memory triggers, often
• They may be foul
• Real stinkers?
• Dump outputs
• Vent emanations
• Warnings of gas leaks
• Clean-out-the-fridge warnings
• They stink
• Smells to avoid
• Locker-room emanations
• Many gases lack them
• Baking soda targets
• Ammonia and others
• Nose perceptions
• Trails for bloodhounds