In recent times, the amount of scientific evidence supporting the claim that the air inside of a building is more polluted and contaminated than the air outside the building is continued to grow. This appears to be true even in buildings that are located within some of the most industrial cities in the world. Simultaneously, many studies also suggest that most people spend about nine tenths of their time inside of a building.
The result of this is that most people are likely facing greater threats from pollution inside of their home than outside of it. The reason for all of this indoor pollution are sources that release particulate matter and gases into the air. This activity reduces the quality of the air inside the building so that it often becomes less safe than outdoors.
A building that is not properly ventilated allows these chemicals and contaminants to continue to accumulate over time. This is because the ventilation does not bring in enough air from outside the building in order to dilute the pollutants. Emissions like gas and oil, therefore, simply start to build up in the air.
One of the main sources of this pollution is all of the cleaning products and various other chemicals used in everyday life. Damp carpet, certain furniture, radon, dust, pesticides, and vehicle emissions all contribute to this buildup. These pollutants can start to pose a health risk to the inhabitants of the building, including threats such as cancer.
With all of these threats, it is understandable why it can be very useful to take advantage of an indoor air quality monitor. These work by measuring three different things using three different sensors. The sensors are for carbon monoxide, oxygen, and carbon dioxide.
The oxygen sensor detects oxygen gas by using an electrochemical sensor. When oxygen passes through the sensor, it is used to oxidize a chemical. This generates an electrical current which is used to measure the presence of oxygen in the air. Because of the fact that this sensor is always exposed to oxygen, most of them will eventually burn out within a couple years.
The carbon monoxide sensor is also an electrochemical sensor which operates in much the same way as the oxygen sensor. The carbon dioxide sensor, on the other hand, is an infrared sensor. It sends a beam of infrared light through the sample air. The concentration of carbon dioxide effects how much of this light is absorbed, and this is used to determine the concentration.