Every cell in your body responds to its environment. Temperature, sound, light, air quality, toxins, electromagnetic fields — all of them are inputs that alter gene expression and your hormonal profile. Most people completely ignore this controllable environment.
How to read the numbers: Target = the value we aim for · Risk = what to watch out for
Particle for the lungs
Fine PM2.5 particles are small enough to penetrate deep into the lungs and even the bloodstream, and the WHO considers them one of the most significant environmental health risks. Check air-quality reports and, on smoggy days, ventilate briefly and consider a HEPA air purifier.
Limit for healthy sleep
The WHO Regional Office for Europe recommends that average night-time outdoor noise stay below 40 dB – higher levels are linked to poorer sleep and heart health. If you live on a busy street, well-sealed windows, a bedroom on the quieter side or earplugs can help.
5× worse than outdoors
Volatile organic compounds (VOCs) are released by paints, furniture, cleaning products and air fresheners, so indoor concentrations can be several times higher than outdoors. Ventilate regularly and choose fragrance-free, low-emission products.
Temperature and sleep
The optimal sleeping temperature is 16–19°C. Your body needs to lower its core temperature by 1–2°C to fall asleep. A warm bedroom (above 22°C) directly disrupts REM and deep sleep — measurably.
Air and CO2
CO2 levels rise in a closed bedroom while you sleep. Above 1000 ppm, cognition and sleep quality deteriorate. The fix: gentle ventilation and a CO2 sensor (approx. 30–50 EUR).
Sleep disrupted by sound above 45 dB triggers a rise in cortisol — even if you don't wake up. White noise or earplugs in a noisy environment directly improve your sleep architecture.
Toxins in the home
VOCs (volatile organic compounds) from furniture, carpets and paints. Mould — one of the most frequently overlooked health risks in older buildings. Cleaning products containing endocrine disruptors. Plants (pothos, ficus) filter the air — cheaply and effectively.
