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Formaldehyde is a toxic, irritating and carcenogenic compound, in home environment is released by combustions (incense, wood, candles, e-cigarettes, food during cooking phase, self-cleaning ovens) or it may be slowly exhalated by furniture (fiberboards), costruction items (glues, paints), some household (air fresheners) or cleaning products (detergents). 
It should not exceeed 100 µg/m3, or 82 parts per billion at standard conditions.
Qualaria IAQ can detect it through the range 0-5000 parts per billion, with accuracy equal to or less than 15 parts per billion.
Sensor is temperature compensated and based upon electrochemical technology for better selectivity.
For more information about this substance please check the following study as submitted to the European Commission.
 

Sensors

Precision Formaldehyde Sensor

Volatile Organic Compounds Sensor (VOCs)

Volatile Organic Compounds are a broad range of carbon-based chemicals that are commonly related to indoor air pollution.

Hydrocarbons and fossil source products are among them as well as vegetal and natural substances that are not produced by petroleum extraction. 
Not all the VOCs pose a harm to your health, but keeping their concentration low at home is a good indication of comfort and healthy air.
Qualaria IAQ succeeds in detecting them through the range 0-1000 parts per billion, even if odourless, thanks to a specific Swiss-made metal oxide sensor.

If necessary, the sensor can be recalibrated by using the App.

Carbon Dioxide-equivalent Indication

Carbon dioxide (CO2) is a gas which is commonly present in outside air with a concentration value of around 410 parts per million.

In confined places, being generated by the metabolism of humans and animals through breathing, it tends to accumulate.

Levels higher than 1000 parts per million are related to difficulty of focusing and lower efficiency at study and work.

CO2 Equivalent Level is an estimate of the CO2 present in confined areas occupied by people computed through tVOC sensor reading and math algorithms.

Qualaria IAQ reports the CO2 Equivalent level in the range 400-2000 parts per million.

Temperature and Relative Humidity Sensor.

 Thanks to its idesign, the sensor can directly read air temperature and relative humidity without software-based corrections and inaccuracy due to self-heating. 

Positioning of sensor out of the enclosure and our study on material characteristics are meant to deliver a correct readout using natural ventilation.

As a result the sensor does not need any adjusting after the purchase.

In standard conditions typical accuracy is ± 0.3 Celsius degrees for temperature and ± 2% for relative humidity.

Component is made up of plant-derived, biodegradable and environmental friendly plastics.