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Why to measure CO and NO2 in underground parking garages?

Sensors in an HVAC environment

 
Carbon monoxide or CO and nitrogen dioxides or NO2 are often referred to as toxic gases stemming from motor vehicle sources. When cars with combustion engines move around an enclosed parking garage, they release toxic gases like CO and NO2. Due to the typically low ceiling, underground and enclosed car parks present a particular challenge to ventilation systems. Such smart ventilation system must prevent the accumulation of toxic gases from motor exhausts. Toxic gas sensors are optimized to detect and measure these toxic gases in parking garages. 
 
 
Carbon monoxide or CO is produced when combustion reactions are not fully completed, either through lack of oxygen or due to low mixing.  All combustion sources, including motor vehicles, power stations, waste incinerators, domestic gas boilers, and cookers, emit carbon monoxide.
The natural CO content in the ambient air is approximately 0.2 ppm (parts per million). Carbon monoxide is not poisonous but has a temporary effect on the human respiratory system. CO attaches itself to red blood cells, preventing the uptake of oxygen. High concentrations of CO can cause physiological and pathological changes and ultimately death. Since it is a colorless and odorless gas, it is often called the silent killer.

The World Health Organization has established reference values for concentrations and exposure times that are considered harmless for the entire population, including pregnant women and the elderly with (known or unknown) cardiovascular and respiratory problems:

10 mg/m3   (9 ppm)    during 8 hours.
30 mg/m3   (26 ppm)  during 1 hour.
60 mg/m3   (52 ppm)  during 30 min.
100 mg/m3 (90 ppm) during 15 min.
 
 
 
Nitrogen dioxide or NO2 is generally considered a useful indicator for measuring and judging air pollution stemming from motor vehicle sources. Breathing air with a high concentration of NO2 can irritate airways in the human respiratory system. WHO epidemiological studies have shown that symptoms of bronchitis in asthmatic children increase in association with long-term exposure to NO2
The human health limit value for NO2 concentration recommended by WHO is: 190 µg/m3 (100 ppb) during 1 hour.
 
Sentera offers a complete range of toxic gas sensors that measure CO and NO2 concentrations. They are available in different enclosures and with different supply voltages.
 
 
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