hcho_float (formaldehyde concentration)

Last updated on June 23, 2026

Data type: FLOAT(0, 1.999)

Usage method: stores the device state without changing it.

Purpose: shows the current HCHO level in mg/m³ (milligrams per cubic meter). It takes a value from the range of 0-1,999 mg/m³.

Devices with this function

sensor_air — air quality sensor.

Examples of voice commands

— Салют, какой уровень формальдегида? (Salute, what is the level of formaldehyde?)

— Салют, проверь воздух на содержание формальдегида. (Salute, check the air for formaldehyde content.)

Function description for a device model

The function must be added to the model descriptions of all devices that support it.

"features": [
    "hcho_float",
    // ...
 ]

Function state description example

The example describes a sensor reporting that the HCHO level is 0,205 mg/m³.

{
    "states": [
        {
            "key": "hcho_float",
            "value": {
                "type": "FLOAT",
                "float_value": "0.205"
            }
        }
    ]
}