1.Sources of Ozone.

Ozone in the air mainly comes from the atmospheric environment. The normal atmosphere contains a very small amount of ozone, with a concentration of about0.02~0.06mg/m3, the average is0.03mg/m3. While the sulfur dioxide and nitrogen oxides that pollute the city produce photochemical smog, the generated ozone concentration will exceed the atmospheric background value several times or even ten times. The maximum allowable concentration in natural air is0.1mg/m3A new standard in the United States states that0.08 mg/m3. Japanese data show that in the eastern part of Japan, the ozone concentration in the air drifting from China exceeded0.06ppm(The ozone concentration index in Japanese environmental standards is0.06ppm）。

In industrialized countries, the source of ozone in urban air is mainly the product of photochemical catalytic reaction of automobile exhaust. Due to the rapid development of the automobile industry, ozone has become a major pollutant in the air of industrially developed countries. The level of photochemical pollution caused by automobile exhaust in Beijing, Guangzhou, Shanghai and other cities in China is increasing year by year, and ozone pollution is on the rise.1997To2000In, the annual ozone concentration in Beijing exceeded the national secondary standard (0.20 mg/m3) the time has71Day.

2.Hazards of Ozone.

Ozone can reach the deep part of the respiratory tract, which has a strong stimulating effect on the respiratory organs and causes the contraction of the respiratory tract. Its degree of stimulation is better than nitrogen oxides and sulfur dioxide, and its toxicity to the respiratory system is greater than that of nitrogen oxides.10times more. The olfactory threshold of ozone is very low, and the concentration reaches0.02 ppmWhen you can smell the smell;0.1ppmWhen breathing.2hours, will reduce lung capacity20%, reach0.3ppm, stimulating the nose and brain; more1ppmAt that time, the eyes, nose and throat are dry, with burning sensation and headache. After a long time, the central nervous system will be hindered and the thinking will be disordered.10ppmWhen, easy to cause emphysema. In addition, ozone can also hinder the function of blood oxygen transmission, resulting in tissue hypoxia; damage to thyroid function, bone calcification, and also cause potential systemic effects, such as inducing chromosomal aberrations in lymphocytes, damaging the activity of certain enzymes and producing hemolytic reactions. Numerous experimental studies have shown that exposure to ozone concentrations0.16 mg/m3in the air environment,6.6hours, healthy people will have a significant manifestation of adverse effects;0.30 mg/m3It can cause a cough. Experiments by Chinese researchers also show that the ozone concentration reaches0.10～0.14 mg/m3The physiological indicators of the human body will produce changes in sensitivity. The World Health Organization believes that for those who are sensitive to exercise, the ozone concentration is0.20 mg/m3exposure to the air environment1To8hours, its respiratory system will be significantly damaged. Children with asthma are the most sensitive group. When the ozone concentration exceeds a certain concentration, their health is most affected, and the condition may worsen. World Health Organization Choice8Hourly Average0.12 mg/m3As2000The newly revised air quality health standard limits in. The atmospheric standards formulated by our country are0.1 mg/m3。

3.Ozone monitoring.

In this Shenzhen Technology Co., Ltd. recommend an ozone sensorOX-B431The sensor has the characteristics of fast response, anti-interference, high resolution, good linearity and high sensitivity. The sensor is a four-electrode electrochemical sensor, which is different from the regular three-electrode electrochemical sensor,OX-B431An additional auxiliary pole is used to compensate for the zero current, so that the sensor has a more stable zero point, which can be detected.ppblevels of ozone gas.

Below isOX-B431Some of the parameters:

Range:0-20ppm

Resolution:15ppb

Sensitivity:-225~-75nA/ppm

Overload:50ppm

Size: φ32.3X16.5