Symptoms
Start from how you feel
Three everyday complaints with a measurable, fixable air component. Each page gives the mechanism, the studies, the fixes ranked by cost — and, because honesty beats traffic, the common causes that have nothing to do with air.
Each page follows the same shape: the quick answer, the mechanism with the arithmetic, what controlled studies actually measured, the non-air causes worth ruling out, then fixes ordered from free to ~$250. Nothing here requires buying anything to start — the first three fixes on every page cost $0.
Why do I get sleepy in meetings?
Small room + closed door + people = arithmetic. Roughly +1,000 ppm per hour.
Read →Why do I wake up with a headache?
Closed bedrooms hit ~2,600 ppm by morning. Also: the one gas you must rule out first.
Read →Why is my brain foggy at work?
Sick building syndrome usually has a boring cause: how much outdoor air the HVAC brings you.
Read →These pages are information, not diagnosis. Symptoms that are severe, persistent, or getting worse belong with a clinician — air or no air. Full disclaimer.