Cognitive performance doubles with good air, delirium drops by a third with better room design. The research exists but it doesn't reach the planning process.

A developer decides the air quality. The healthcare system pays the consequences. Europe: 1.6 trillion dollars a year.

Green is losing traction, health is gaining. The market pays premiums for healthy buildings, the EU mandates indoor quality. Transposition deadline: May 2026.

I have been doing the same thing for thirty years: taking data from different sources and building structures that someone can base a decision on. I recently learned that this has a name.

Two hours of nature per week are enough for a measurable health effect. Below that nothing happens. Most cities are built as if nobody knew.