The core idea
Particle sensors can reveal timing and relative changes, but low-cost devices do not identify composition or health risk by themselves.
How the mechanism works
Cooking, candles, outdoor air, dust disturbance and combustion create particles of different sizes and chemistry.
When it becomes relevant
Typical trigger: Activities, outdoor events or HVAC operation.
Evidence that supports this interpretation
- Peaks align with a repeatable activity
- Multiple sensors show similar timing
- Ventilation changes the decay curve
Evidence that weakens it
- The sensor is contaminated or saturated
- No timing relationship exists
- Only one device reports the event
What this concept cannot prove alone
A single observation, image or meter reading cannot confirm the complete failure pathway. Use this concept to form better questions, compare alternatives and decide which safe observation would be most informative next.
Safety and professional boundary
Smoke, fire, combustion or hazardous-material disturbance requires immediate safety action and professional guidance.
Primary references for this topic family
These references ground the general building-science or safety context. They do not diagnose a specific house, replace local requirements or certify a repair.
