Experts blame toxic plastic runway.
The Primary School Attached to Beijing Normal University announced "Air Quality Data Above Runway"
Experts say that nosebleeds are the most common condition in children; The incidence of allergic rhinitis among children in Shenzhen is about 20%.
Li Li
Shenzhen Special Zone News (Reporter Li Li) Recently, some of the runways of Nanshan Primary School affiliated to Beijing Normal University were found to exceed the standard, and the education department decided to "suspend classes", which once again attracted media and public attention. Yesterday, the reporter interviewed experts in related fields and asked them to answer questions that the media and some parents of students are concerned about.
Professor Wang Qingguo, Dean of the School of International Exchange of Shenzhen University and Ph.D. in Polymer Chemistry, believes that the rubber track has passed the sample retention test and the normal sample test, which proves that there is no problem with the material of the track itself. The samples used are "runway surface layer and adhesive layer after construction". Therefore, the test result exceeds the standard not because the runway itself is unqualified, but because the volatilization time of the adhesive is not enough and needs further ventilation and volatilization.
It is reported that the environmental water department of Nanshan District specially invited the municipal environmental monitoring station to send environmental inspection vehicles to monitor the air quality above the school playground in real time under the witness of many parents.
As of press time, the first batch of monitoring data has been obtained. The contents of toluene and xylene at the height of 1m above the runway are 0.0023㎎/ m3 and 0.0052㎎/ m3, respectively, which are about 1/86.9 and 86.9 according to the indoor standard of toluene and xylene of 0.20㎎/ m3. At the heights of 1/90.9 and 1/38 above the lawn in the middle of the playground, the toluene content is 0.0022㎎/ m3, and the xylene content is 0.0052㎎/ m3.
The school said that 1 1.9 will continue to monitor at noon and release relevant data in time.
Regarding the parents' complaints about children's nosebleeds, the reporter learned from Xin Wang, head of the emergency office of Nanshan CDC that toluene and xylene will not cause children's nosebleeds in clinic. The introduction of Yang Qiong, the chief physician of the Department of Otolaryngology in Nanshan Hospital, also verified this view. She said that the mild symptoms of toluene and xylene poisoning are cough and stinging eyes. Nosebleed is the most common disease in children. There are many reasons, such as high incidence in dry season and excessive air conditioning in summer. The incidence of allergic rhinitis among children in Shenzhen is about 20%. If children often pick their noses, they are more likely to continue to cause bleeding.
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