Nitrogen oxide pollution is a point that cannot be ignored in air pollution. There is now a NOx monitoring system to monitor the nitrogen oxide content in the atmosphere. Provide a scientific basis for air pollution control.
Types of nitrogen oxides
There are many types of nitrogen oxides. Such as N2O, NO2, NO2, N2O3, N2O4 and N2O5. Except for NO2, other nitrogen oxides are extremely unstable, and become NO2 and NO when exposed to light, humidity or heat, and NO becomes NO2 again. The main cause of air pollution is NO2 and NO.
Nitrogen oxides are harmful to the human body
Nitrogen oxides have varying degrees of toxicity. NO is a blood poison, and its ability to bind to hemoglobin is stronger than carbon monoxide, and it is more likely to cause hypoxia in the human body. Under anaerobic conditions, inhaling NO can make the body in a state of hypoxia and suffocation. Cause brain damage, produce central nerve palsy and spasm. The toxicity of NO2 is mainly the irritation to the eyes and the effect on the respiratory function. The irritation and corrosion burn lung tissues, make breathing fast, and cause bronchiectasis after entering the lower respiratory tract. Even toxic pneumonia and pulmonary edema can damage the function of the heart, liver, and kidneys and hematopoietic tissue. Severe ones can lead to death. NO2 dissolves in water to generate nitric acid and nitrous acid, and then reacts with alkaline substances in water to generate nitrate and nitrous acid.
The source of nitrogen oxides in the atmosphere
One is the natural emission of NOx, which mainly comes from the decomposition of organic matter in the soil and the ocean, and belongs to the natural nitrogen cycle process. The other is the burning of fossil fuels. The closest thing to us is gasoline. In fact, gasoline does not contain nitrogen, but the oxygen in the air burns with gasoline to produce high temperature. Under high temperature conditions, nitrogen also reacts with oxygen to produce NO. Finally, it is discharged into the air together with the combustion exhaust gas. Nitrogen-containing compounds generally exist in coal, which are easier to participate in the reaction than nitrogen in the air, and produce nitrogen oxides at a faster rate, and are not affected by combustion conditions.
Nitrogen oxide monitoring equipment helps air pollution control
Nitrogen oxides can also cause many hazards such as acid rain, photochemical smog, and ozone layer depletion. The NOx monitoring system can accurately detect the nitrogen oxide content in the atmosphere and provide help for pollutant control.