Blockade measures have been taken due to new coronavirus, and the concentration of nitrogen dioxide has remained low throughout Europe.
The latest data from the EU Copernicus Sentinel-5P satellite shows that compared with the same period last year, the nitrogen dioxide concentration in some cities has dropped by 45-50%.
The image shows the average nitrogen dioxide concentration from March to April 2019 and the nitrogen dioxide concentration from March 13 to April 13, 2020. The redder the color, the higher the nitrogen dioxide concentration.
The average concentration of nitrogen dioxide in Europe from March to April 2019 and the concentration of nitrogen dioxide from March 13 to April 13, 2020.
After comparison, it was found that the concentration of nitrogen dioxide in Madrid, Spain decreased by 48% year-on-year, that of Milan, Italy, decreased by 47%, that of Rome, Italy, decreased by 49%, and that of Paris, France, which dropped by 54%, with a concentration error of ± 15%.
Nitrogen dioxide refers to brown-red toxic gas at high temperature. The artificially produced nitrogen dioxide mainly comes from the exhaust of motor vehicles and the exhaust gas discharged from industrial facilities. Due to fluctuations in emissions and changes in weather conditions, the concentration of nitrogen dioxide in the atmosphere varies greatly from day to day.
Spain implemented a 15-day “lockdown” measure nationwide from March 14, the concentration of nitrogen dioxide in Spain changed.
Scientists at the Royal Netherlands Meteorological Institute (KNMI) have used Copernicus Sentinel-5P satellites to monitor European air pollution in the past few months. Long-term monitoring data helps to eliminate the changes in nitrogen dioxide concentration caused by other factors. The Royal Netherlands Meteorological Institute said that this is a reduction in the concentration of nitrogen dioxide caused by human activities.
In order to prevent the spread of the New coronavirus epidemic, Italy entered the state of “lockdown” from March 10, and all stores except food stores and pharmacies closeded from March 12, and all parks closed from March 21. And other public places.
Italian Prime Minister Conte announced on April 1 that the end of the “lockdown” measure extended from April 3 to April 13. It was announced again on April 10 that the national “lockdown” measures originally scheduled to end on April 13 would be extended to May 3.
A series of control measures in France, including the “closing of the city”, have been implemented since March 17, originally planned for 15 days. It was then announced that the stringent control measures extended for another two weeks until April 15.