How does an air quality meter work?

When a room or closed place is poorly ventilated, it has a greater risk of air pollution and, therefore, of virus transmission, headaches, dizziness or respiratory problems among others. In addition, it may involve problem for many establishments regarding licenses or openings as considered pandemic danger.

For this reason, the control and measurement of CO2 or air quality is already taking place both in homes and spaces for private use and, almost by obligation, in shops, schools, hotels, restaurants and other public establishments.

But, we know how a CO2 meter works?

Below we detail the CO2 measurement unit, what is considered normal values and mode of operation of CO2 sensors, so you can maintain optimal air quality in your everyday spaces or workplace.


How a CO2 detector works

With a CO2 sensor asAirGuardian, you can:

  • Control air quality;
  • Know the health index in a home;
  • Obtain comprehensive information on the air quality of the space;
  • Receive immediate alerts on your phone when the air quality is not within the proper range.

In short, the AirGuardian smart device measures indoor air quality and sends notifications through the mobile app so you can make sure the room is always adequately ventilated.


How to measure CO2?

Carbon dioxide, one of the main greenhouse gases, is measured and expressed, among other units, in PPM Parts per Million, that is, the number of CO2 molecules present in one million air molecules.e.

Indoors, CO2 levels generally vary between 400 and 5000 ppm.


How many ppm of CO2 are normal?

 Outdoors, the correct CO2 level would be 400 ppm.

Indoors, it varies depending on space, number of people, activity and regular use. Therefore, the levels of carbon dioxide can vary. For example, a room or meeting room that is regularly ventilated should be below 800 ppm.

Whereas, in a small room at night or a closed meeting room, it can well exceed 1000 ppm.

Generally speaking, a room or meeting room with regular ventilation can maintain a CO2 level of up to 1000 ppm.


When are alert values on a CO2 meter?

When CO2 levels are above 2000 ppm, we can suffer from drowsiness, fatigue, headaches and even dizziness.

To avoid this, the CO2 concentration should always be kept at the levels mentioned above, between 400 and 1000 ppm.

When the CO2 alert values are exceeded, the AirGuardian air quality meter sends the corresponding notifications to the mobile so that we can air the interior space. These are:

  • First alert: when it exceeds 750 ppm;
  • Second alert: between 750 - 1000 ppm;
  • Third alert: when exceeding the 1000 ppm.

This way, you can keep closed spaces safe by ventilating whenever you need it.


What type of sensor evaluates air quality?

To assess indoor air quality, there are several types of sensors depending on the needs and peculiarities of the space. These are:

  • Concentration sensors VOC (Volatile Organic Compounds, chemicals that easily turn into vapors or gases;;
  • Sensor PM 2.5 , which evaluate fine particles in suspension;
  • Sensor humidity , to measure the temperature and relative humidity in a given environment;
  • CO2 sensor, to measure air quality in a given space.

The CO2 Sensor, such as the one in AirGuardian , is the one used for the evaluation of the air quality of a home, office, hotel, restaurant, business, college , etc. It measures carbon dioxide gas in ppm and alerts the mobile phone with notifications through its application when the CO2 concentration is high and the space must be ventilated.


Thanks to this air quality meter, we can optimize ventilation in order to guarantee safe spaces and a cleaner and healthier indoor environment.

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