Air ventilation and air conditioning are for more than just keeping us cool and comfortable. These systems are often designed to ensure proper oxygen flow, to dilute indoor pollutants and odors, and eliminate harmful toxic substances given off by indoor processes. They also remove residual indoor heat or moisture. They are typically applied in underground parking garages, factories, office buildings, and other large indoor spaces.

In recent years, indoor CO poisoning incidents occur frequently. Many green building design standards set rules that the underground garage with mechanical ventilation should be equipped special analyzer to monitor and control CO concentration in real time.

In recent years, the government has set rules that the underground garage with mechanical ventilation should be equipped special analyzers to monitor and control CO concentration in real time.

Carbon monoxide is a colorless, odorless gas which does great harm to human body with excessive content. It binds to hemoglobin in the blood which will lead to hypoxia. The most common symptoms of carbon monoxide poisoning are those such as headache, vomiting, dizziness, fatigue and weakness. Besides, the heart and central nervous system can be severely damaged by carbon monoxide and there are many sequels after carbon monoxide poisoning.

• When the concentration of carbon monoxide in the air reaches to 50 ppm, healthy adults can endure 8 hours;
• When the concentration reaches to 200 ppm, healthy adults have a slight headache and fatigue after 2-3 hours;
• When the concentration reaches to 400 ppm, healthy adults have frontal pain within 1-2 hours and life-threatening after 3 hours;
• When the concentration reaches to 800 ppm, healthy adults lost consciousness within 2 hours and died within 2 to 3 hours.

More and more attention has been paid to the working and living environment of human beings indoor or in workshop. The gases O2, CO2, CO, NO, NO2, SO2, etc are all present and should be monitored.