As we all know, CO2 is non-toxic in terms of gas properties, and the content of carbon dioxide in fresh air is about 0.03%. People living in this space will not be harmed; however, if many people gather indoors and the air is not ventilated, or There are coal gas, liquefied petroleum gas and coal stoves burning indoors, so that the oxygen content in the air is relatively reduced, and a large amount of carbon dioxide is produced, and the indoor personnel will have different degrees of poisoning symptoms. The national standard stipulates that carbon dioxide should not exceed 0.07-0.10% in public places where people stay for a long time, and should not exceed 0.15% in short-term places.

It is generally believed that the concentration of carbon dioxide is one of the indicators of air quality in offices and homes, which can tell people whether ventilation is needed. Therefore, to detect environmental quality indoors, especially in densely populated places, it is necessary to monitor CO2 concentration in real time and to ventilate regularly.

Carbon dioxide dangerous concentration value:

1000-1500ppm: It belongs to the critical air, and the human body begins to feel uncomfortable

1500-2000ppm: light pollution, more than 2000ppm is serious pollution, the body feels weak in the limbs

When the concentration reaches 3%-4%: people's breathing deepens, symptoms such as headache, tinnitus, and increased blood pressure appear

Concentrations up to 8%-10%: cause breathing difficulties, rapid pulse, general weakness, and unconsciousness

Concentration of 10%-20%: May cause death by suffocation.

General hypoxia, everyone has experienced. Shortness of breath, limb weakness, drowsiness, lack of concentration, etc. Such a concentration range, although not life-threatening, will also cause damage to health. Severe hypoxia is even more terrifying, and is likely to cause permanent brain damage, coma, and even death. So why is too much carbon dioxide hypoxia?

Because when people breathe, they take in oxygen and exhale carbon dioxide. With more carbon dioxide, the oxygen content in the air will decrease accordingly, and people have become accustomed to the oxygen content in the living environment. When the oxygen absorption is insufficient, it will naturally lead to people's discomfort, causing people to breathe and other symptoms of hypoxia. At present, the current indoor air quality standards at home and abroad all list carbon dioxide as a key pollutant, and its content has long been an important indicator for evaluating indoor air quality.