Indoor air and odors
How humidity, particles, gases, combustion and pressure shape indoor-air clues without turning one reading into a diagnosis.
Learn the concept, then apply the field method.
The collection alternates between building-science explanation and bounded homeowner observation. It does not turn one clue into a diagnosis.
Relative humidity as context: what it means in a house
Relative humidity changes with temperature, so the same moisture content can produce very different readings in different rooms or seasons.
Continue →FIELD METHOD · 1 MINRelative humidity as context: an evidence-first field method
A practical method for observing, comparing and documenting relative humidity as context without turning one clue into a diagnosis.
Continue →CONCEPT GUIDE · 1 MINCarbon dioxide as a ventilation indicator: what it means in a house
Indoor carbon dioxide can indicate occupancy-related ventilation performance but is not a complete indoor-air-quality score.
Continue →FIELD METHOD · 1 MINCarbon dioxide as a ventilation indicator: an evidence-first field method
A practical method for observing, comparing and documenting carbon dioxide as a ventilation indicator without turning one clue into a diagnosis.
Continue →CONCEPT GUIDE · 1 MINParticles, sources and sensor limits: what it means in a house
Particle sensors can reveal timing and relative changes, but low-cost devices do not identify composition or health risk by themselves.
Continue →FIELD METHOD · 1 MINParticles, sources and sensor limits: an evidence-first field method
A practical method for observing, comparing and documenting particles, sources and sensor limits without turning one clue into a diagnosis.
Continue →CONCEPT GUIDE · 1 MINVOC readings and odor claims: what it means in a house
A general VOC sensor may show changes but usually cannot identify the chemical, source or safety significance.
Continue →FIELD METHOD · 1 MINVOC readings and odor claims: an evidence-first field method
A practical method for observing, comparing and documenting voc readings and odor claims without turning one clue into a diagnosis.
Continue →CONCEPT GUIDE · 1 MINMusty odor without visible growth: what it means in a house
A musty odor can indicate damp materials or microbial activity, but odor location may be an airflow exit rather than the source.
Continue →FIELD METHOD · 1 MINMusty odor without visible growth: an evidence-first field method
A practical method for observing, comparing and documenting musty odor without visible growth without turning one clue into a diagnosis.
Continue →CONCEPT GUIDE · 1 MINCombustion odor and backdraft risk: what it means in a house
Combustion odor, soot or alarm events can signal unsafe venting and should stop normal self-help investigation.
Continue →FIELD METHOD · 1 MINCombustion odor and backdraft risk: an evidence-first field method
A practical method for observing, comparing and documenting combustion odor and backdraft risk without turning one clue into a diagnosis.
Continue →Use the cluster to ask better questions.
House symptoms often cross systems. Keep competing explanations visible, preserve the baseline and stop where access, electricity, combustion, structure, contamination or hazardous materials create a professional boundary.
