Learning Center

Plain-language explanations of the measurements, sensors and numbers behind environmental monitoring.

The 24-hour number tells you what is happening now. The 90-day number tells you your risk.

A radioactive gas from the ground, the second leading cause of lung cancer, and invisible to every sense.

The one VOC with its own guideline, its own sensor and a habit of coming from your furniture.

Solvents evaporate for hours; some coatings off-gas for weeks. The monitor shows the whole curve.

VOC is a family of chemicals. TVOC is a sensor's guess at their sum. Neither is a specific measurement.

Total volatile organic compounds: one number for hundreds of chemicals, from one sensor that cannot tell them apart.

They count light, not mass, and each converts with its own assumptions.

Ultrasonic humidifiers turn dissolved minerals into fine dust. Evaporative ones do not.

Hot oil, searing and toasting generate fine aerosol. Cooking is the biggest particle source in most homes.

PM1 is the sub-micrometer fraction: combustion soot and the particles that reach the bloodstream.

Small volume, many sources, slow exchange. The math of a building explains the numbers.

Sprays spike VOCs, dusting spikes particles, and the monitor sees both before you smell them.