Learning Center

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

A fan only helps if it pushes air in or out of the room. In a closed room it changes nothing.

Only if it brings in outdoor air. Most home units recirculate, and CO₂ keeps rising.

No. HEPA and carbon filters catch particles and some gases, but CO₂ passes straight through.

A room of houseplants absorbs a small fraction of what one person exhales. The numbers.

Sensor response time, sampling interval and room mixing each add their own delay.

Stated accuracy, placement, baseline drift and sensor type explain almost every gap.

Breath is 40,000 ppm. A person within a meter of the sensor can add hundreds of ppm in seconds.

Usually, but how fast depends on wind, temperature difference and where the air can go.

Closed doors, sleeping people and no ventilation: why bedrooms hit 2,000 ppm by morning.

One is a ventilation indicator; the other is a poison. Different gases, different detectors.

Automatic baseline correction, manual fresh-air calibration and when each is needed.

What ±(50 ppm + 3%) means and the errors that dwarf it.