On the source of carbon dioxide poisoning
There are various situations in the world, and there are many reasons for carbon dioxide poisoning. There are three sources. The first is a closed place, where the air does not flow, the second is the release of burning materials, and the third is the call of living things.

A closed place, such as a deep cellar, a tunnel, and a mine, people enter it, and carbon dioxide is easy to accumulate but difficult to disperse. In this environment, the air is blocked, fresh and external pass, carbon dioxide gradually accumulates, and the concentration rises. People are in the middle of it, and they are easy to fall into the danger of poisoning.

The burning of fuel is also the source of poisoning. When firewood, coal, and oil are burned, oxygen is consumed and carbon dioxide is released. If it is burned in a narrow room, the ventilation is not smooth, and the carbon dioxide is flooded, and people absorb it, which will damage their health and cause poisoning.

Furthermore, the breathing of living things. Humans and all kinds of animals breathe oxygen and spit out carbon dioxide. If they cluster in a narrow place, carbon dioxide accumulates rapidly, and the oxygen gradually becomes thin, people feel stuffy, dizzy, and even fainting from poisoning.

Therefore, in order to avoid the harm of carbon dioxide poisoning, when the heavy ventilation and ventilation, work in a closed place, first measure the carbon dioxide content in the air to ensure safety before entering. When burning materials are in the room, they must be placed in a well-ventilated place, and ventilators must be checked frequently to make them travel smoothly. In places where people live in groups, they should also pay attention to spacious space and air circulation, so as to reduce the risk of poisoning and protect their health.