European Space Agency publishes "Air Pollution Map" that shows at a glance how air pollution has decreased due to the effect of the new coronavirus


European Space Agency publishes "Air Pollution Map" that shows at a glance how air pollution has decreased due to the effect of the new coronavirus

Under the influence of the new coronavirus infection (COVID-19) that is prevalent in the world in 2020,ChinaOrItaly,IndiaIt is known that air pollution is decreasing all over the world. Meanwhile,European Space Agency (ESA)Earth observation satellite launched in 2017 bySentinel-5PIt is used as an index of air pollution based on the observation data ofNitrogen dioxideWe released "Air pollution map" to check the concentration of.

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Sentinel-5P isEuropean UnionIs a policy enforcement agency ofEuropean Commission (EC)The Earth Observation Project “for the purpose of collecting data used byCopernicus planIt is one of the earth observation satellites launched as a part of. Although the data collected by the Copernicus project can be used for agricultural management, disaster response, climate change prediction, etc., Sentinel-5P is specifically aimed at monitoring atmospheric composition, ozone layer status, and air pollution.

One of the substances that Sentinel-5P is observing is released when burning fossil fuels at power plants, vehicles, and industrial facilities.Nitrogen dioxidethere is. Since the emission of nitrogen dioxide is greatly influenced by human industrial activities, COVID-19's pandemic reduced the movement of people and industrial activities.Emissions are reported to be decreasing around the world.. ESA continuously monitors the nitrogen dioxide concentration in the atmosphere with Sentinel-5P, and released the result as a map on June 11, 2020 (Thursday).

actuallyPublished mapWhen is opened, a map is displayed in which the concentration of nitrogen dioxide in the atmosphere is represented by the shades of red. Since the amount of nitrogen dioxide in the atmosphere fluctuates due to short-term fluctuations in weather, ESA uses the average of the data for the last two weeks to create a map that suppresses fluctuations as much as possible.

The map can be enlarged/reduced by operating the buttons on the upper left, and can be moved by dragging the cursor on the map. If you look at northern Europe, you can see that nitrogen dioxide concentration is high around England, Germany, Belgium and Paris.

If you extend the map to the whole world, you can see that the amount of nitrogen dioxide around China and Japan is particularly high. When I try to enlarge it…

The red color was much darker in the coastal areas of China, South Korea, and the urban areas of Japan.

In Japan, you can see that the concentration of nitrogen dioxide is high around the Seto Inland Sea and northern Kyushu, mainly in large metropolitan areas such as Tokyo, Nagoya, and Osaka.

Looking at the United States, it seems that nitrogen dioxide emissions are high around Los Angeles on the west coast, around the Great Lakes bordering Canada, and near New York on the east coast.

In Africa, especially in the vicinity of Johannesburg in South Africa, nitrogen dioxide emissions are high.

You can change the time period for which the data was collected by clicking the arrow buttons beside the dates displayed at the bottom of the map.

As a test, I tried to display the amount of nitrogen dioxide from December 2 to 16, 2019 before COVID-19 spread all over the world.

The amount of nitrogen dioxide in Japan and China is like this.

Comparing the data from May 28, 2020 to June 11, 2020, it is clear that nitrogen dioxide emissions have decreased significantly.

Comparing the range to Europe…

After all, it seems that the amount of nitrogen dioxide emission is drastically decreasing as a whole.

In America…

Similar changes were seen.

The map released this time can be traced to the data from April 30th to May 14th, 2018, and it not only compares the degree of air pollution with that before the COVID-19 pandemic but also shows the seasonal air pollution. It was also possible to visually investigate fluctuations.

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