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Original title: PM10 concentration remains high in many parts of the north Expert: Sand and dust “backflow” is related to southwestern airflow and movement characteristics Source: CCTV News Client
Affected by the retention and return of sand and dust, the concentration of PM10 is still high today (17º) in many parts of the north of my country.How much impact did the sand and dust climate have on the environment of our country? CCTV reporter Liu Jie interpreted the relevant situation through a video connection.
Affected by the reflux of sand and dust, the concentration of PM10 remains high in many parts of the north.
CCTV reporter Liu Jie:Now I am in the Center for Environmental Application of Satellites of the Ministry of Ecology and Environment. Affected by the ebb and retention of sand and dust, the sand and dust in the north of my country are making a comeback. Today I invited Zhang Lijuan, an expert in the atmospheric chamber of the satellite center, to introduce us to this sand. How has the impact of the return of dust on the environment changed since the day before yesterday?
Zhang Lijuan, Director of the Pollution Sources Office, Satellite Environmental Applications Center, Ministry of Ecology and Environment:The sand and dust process took place mainly in the early hours of the morning on the 14th. The area between the southern part of Mongolia and the middle and western part of Inner Mongolia quickly rose from the sand and moved rapidly to the east. and the south under the action of cold air. affects Ningxia, Shaanxi, Shanxi, Beijing and Tianjin Air quality in most of Hebei and northeast China.
Large-scale rainfall in the east of my country ended on the 18th
Zhang Lijuan, Director of the Pollution Sources Office, Satellite Environmental Applications Center, Ministry of Ecology and Environment:On the 18th, the eastern part of my country will receive large-scale rainfall, and the floating dust may basically come to an end. However, from 19 to 21, affected by strong cold air, there was floating sand and dust in central and western Inner Mongolia, Ningxia and other places. Cold air can affect air quality in central and eastern regions.
Safety belts are mainly used to protect local sand and dust.
Zhang Lijuan, Director of the Pollution Sources Office, Satellite Environmental Applications Center, Ministry of Ecology and Environment:In general, protection forest construction is mainly used to protect local sand and dust. For sand and dust transported to high altitudes and long distances in the Mongolian sand source this time, the transmission height can reach hundreds or even thousands of meters. The effect is limited.
Expert interpretation: sand and dust “ebb” is related to southwesterly air flow and movement characteristics
According to experts, the stagnation and return of the dust is related to the movement characteristics of the dust and the air flow of the southwest. Experts said the main body of sand and dust gradually moved out of Beijing yesterday morning. However, due to the relatively large range of sand and dust this time, although the main body of sand and dust has moved out of Beijing, it has not gone too far. The wind direction in Beijing changed to a southwest wind, so sand and dust that did not travel far began to flow backwards to affect Beijing.
(Liu Jie, CCTV reporter)
(Edited by Feng Shuqi)
