Glossary
The words that show up in a water report, an air reading, or a light measurement, defined in plain language and linked to the science behind them.
PFAS are synthetic 'forever chemicals' that resist breaking down and build up in the body, which they reach mainly through drinking water.
Trihalomethanes (THMs)TrihalomethanesTrihalomethanes are disinfection byproducts formed when chlorine reacts with organic matter in source water. They appear in essentially every chlorinated tap.
PM2.5 (fine particulate matter)Particulate matter 2.5 micrometers in diameter or smallerPM2.5 is airborne particles 2.5 micrometers or smaller, fine enough to reach the deep lung and, at the smallest sizes, pass into the bloodstream.
Carbon dioxide (CO2)Carbon dioxideIndoor CO2 is a ventilation marker, not a poison. The reading tracks how much fresh outdoor air is reaching a room relative to the people breathing in it.
Reverse osmosis (RO)Reverse osmosisA point-of-use filter that pushes water through a fine membrane, pulling out dissolved contaminants that carbon filters miss.
ERV / HRVEnergy Recovery Ventilator / Heat Recovery VentilatorBalanced whole-house ventilation that swaps stale indoor air for filtered outdoor air while recovering most of the heat and moisture, so ventilating costs little comfort.
mEDIMelanopic equivalent daylight illuminancemEDI is the light measure weighted to the eye's circadian receptor, capturing the blue-wavelength signal your body clock reads that plain lux misses.