Dashboard vocabulary

The interpretation layer uses about eight terms with specific meanings. They are worth defining once, in one place, so the AI and the reader use them the same way.

Baseline: the rolling 24-hour median of a parameter in your space. It adapts to your normal but is robust to brief excursions. The VOC and NOₓ indexes use Sensirion's own 24-hour normalization, which is conceptually equivalent. Elevated: above the 75th percentile of your last 30 days, or above an absolute health threshold, whichever is higher. A soft signal. Spike: a change of more than 2 standard deviations from the rolling mean within 5 minutes. A real event, not sensor jitter.

Trend: a sustained directional movement for 6 or more hours. Overnight CO₂ buildup is a trend; a 10-minute VOC pulse is not. Anomaly: a pattern that does not match any entry in the fingerprint catalog. Logged but not interpreted. Fingerprint: the multi-parameter signature of a known scenario (cooking, sleep, cleaning, wildfire infiltration).

Cross-reference: the dashboard checked your indoor reading against the outdoor feed (from the Google Air Quality API) and, where applicable, the Open-Meteo weather forecast. Confidence: how well the current signal matches the AI's expectation. Low confidence does not mean wrong; it means the data is ambiguous, sparse, or near the boundary of the model's domain. The AI surfaces low-confidence calls explicitly rather than hiding them.