12 complete symptom paths42 guides and 60 questions in each1,460 Grade A articlesOne searchable, connected knowledge library140 official sourcesEvidence context with explicit limits
Smell the pathway

Smell Atlas

Follow the pathway, not only the label.

Onset, duration, airflow and nearby systems often separate moisture, drainage, combustion and electrical sources.

Describe your clue →
Dust on heated surfaces01

Hot-dust odor

Often brief at seasonal startup but should fade rather than intensify.

Trigger
first heating cycle
Strongest location
radiator, heater or duct
Open signal profile →
Sensory method

Describe first. Interpret second.

  1. TriggerWhat changed immediately before it began?
  2. CycleDoes it follow startup, flow, heating, wind or room use?
  3. LocationWhere is it strongest, and does that move?
  4. Stop conditionHeat, smoke, gas or electrical odor changes the response immediately.