Abstract Since the beginning of summer, the number of days in the clear sky has gradually increased, but in the days when the fog is not visible, the invisible ozone has become a "trick." Since May, the number of days in which ozone has been the primary pollutant in Zhengzhou has increased dramatically, which has affected air quality...
Since the beginning of summer, the number of days in the clear sky has gradually increased, but in the days when the fog is not visible, the invisible ozone has become a "trick." Since May, the number of days with ozone as the primary pollutant in Zhengzhou has increased dramatically, which has become the main factor affecting air quality standards. To this end, yesterday morning, the Zhengzhou Municipal Environmental Protection Bureau specially organized domestic environmental protection experts to conduct joint consultations to remove the new culprit of atmospheric pollution. Ozone into the primary pollutant in Zhengzhou
Compared to the smog of the publicity, the ozone is obviously much lower-key. The reporter learned from the Zhengzhou Environmental Protection Bureau yesterday that during the period from January 1 to July 31, 2016, the number of days of primary pollutants in Zhengzhou was 70 days, accounting for 33%, of which the air quality reached the standard days for 19 days. The number of days was 51 days; while the primary pollutant in the same period of 2015 was ozone for only 25 days, accounting for 12%, of which the air quality reached 9 days, and the number of days not reached reached 16 days.
According to reports, since May this year, the number of days with ozone as the primary pollutant has increased sharply, which has become the main factor affecting the air quality standards in Zhengzhou. Compared with the same period of last year, it increased by 15 days in May; in June, it increased by 11 days; in July, it increased. 17 days.
A small partner who doesn't understand may ask, is ozone not the umbrella of the earth? In the past, the ozone that was called to be protected every day, suddenly became the primary pollutant?
In this regard, Shao Min, a professor at the School of Environmental Science and Engineering at Peking University, explained that the stratospheric ozone can block ultraviolet rays and protect the earth's living things. It is a well-deserved “earth guardianâ€, but when it is near the ground, due to the strong oxidation of ozone, The mucosal system, the nasal cavity, and the mouth all directly cause damage, so it becomes a "healthy killer."
According to reports, near-surface ozone is highly destructive to the respiratory tract and can also irritate the eyes, reducing visual sensitivity and vision.
In addition, it will destroy the vitamin E in the skin, leaving the skin with wrinkles and dark spots. When the ozone concentration is above 200 μg/m3, it will damage the central nervous system, causing headache, chest pain and decreased thinking ability.
Will focus on rectification from four aspects
According to experts, the ozone caused by pollution near the ground is mainly derived from the photochemical reaction of volatile organic pollutants and nitrogen oxides after illumination. Among them, nitrogen oxides mainly come from coal combustion, automobile exhaust, etc.; volatile organic pollution The source of the material is very complex, and such pollutants are produced in paints, fuels, refineries, dry cleaners, and the like.
In this regard, the relevant person of the Environmental Protection Bureau said that in the next step, Zhengzhou City will promote the ultra-low emission conversion of coal-fired power plants and coal-fired heating boilers with more than 65 tons of steam, the treatment of industrial furnaces and kiln exhaust gas, and the development of volatile organic compounds in key industries. Focus on rectification and comprehensively strengthen the four aspects of motor vehicle pollution prevention and control to carry out centralized rectification (attached).
According to the requirements of the Henan Provincial Party Committee and the provincial government, at the end of 2016, Zhengzhou City will withdraw from the top five air quality rankings of 74 key cities, and will withdraw after the end of 2017.
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