The weather of closing the city

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Due to the blockade measures taken by COVID-19, the concentration of nitrogen dioxide in all parts of Europe is still very low. The latest data from the European Union's Copernicus Sentinel -5P satellite shows that compared with the same period last year, the concentration of nitrogen dioxide in some cities has dropped by 45-50%. The image shows the average concentration of nitrogen dioxide from March to April in 20 19 and the concentration of nitrogen dioxide from March to April in 2020 13. The redder the color, the higher the concentration of nitrogen dioxide.

The average concentration of nitrogen dioxide in Europe from March to April in 20 19 and the concentration of nitrogen dioxide in March to April in 2020.

By comparison, it was found that the concentration of nitrogen dioxide in Madrid, Spain decreased by 48%, in Milan, Italy by 47%, in Rome, Italy by 49% and in Paris, France by 54%, and the concentration error was 15%.

Nitrogen dioxide refers to the reddish-brown toxic gas at high temperature. Man-made nitrogen dioxide mainly comes from vehicle exhaust and industrial facilities. Due to the fluctuation of emissions and the change of weather conditions, the concentration of nitrogen dioxide in the atmosphere changes greatly every day.

Spain implemented a nationwide "city closure" measure from March 15, 2004. Changes of nitrogen dioxide concentration in Spain from March 20 to March 25, 2020.

In the past few months, scientists from the Royal Dutch Meteorological Institute have been using the Copernican Sentinel -5P satellite to monitor air pollution in Europe. Long-term monitoring data is helpful to eliminate the change of nitrogen dioxide concentration caused by other factors. According to the Royal Dutch Meteorological Institute, this is the reduction of nitrogen dioxide concentration caused by human activities.

In order to prevent the further spread of the COVID-19 epidemic, Italy entered a state of "city closure" from March 10, and closed all shops except food stores and pharmacies from March 12, and closed all parks and other public places from March 2 1.

Italian Prime Minister Conte announced on April 1 that the end time of the "city closure" measure would be extended from April 3 to April 13. On April 10, it was announced again that the national "city closure" measure, which was originally scheduled to end on April 13, was extended to May 3.

A series of control measures in France, including "city closure", began to be implemented in March 17, and was originally planned to be implemented in 15 days. Subsequently, it was announced that the strict control measures would be extended for another two weeks to April 15.

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