Satellite images released by NASA and the European Space Agency show a dramatic reduction in nitrogen dioxide emissions -those released by vehicles, power plants and industrial facilities- in major Chinese cities between January and February. The visible cloud of toxic gas hanging over industrial powerhouses almost disappeared.

From February 3 to March 1, CO2 emissions were down by at least 25% because of the measures to contain the coronavirus, according to the Center for Research on Energy and Clean Air (CREA), an air pollution research organization.

As the world's biggest polluter, China contributes 30% of the world's CO2 emissions annually, so the impact of this kind of drop is huge, even over a short period. CREA estimates it is equivalent to 200 million tons of carbon dioxide -- more than half the entire annual emissions output of the UK.

A fall in oil and steel production, and a 70% reduction in domestic flights, contributed to the fall in emissions, according to the CREA. But the biggest driver was the sharp decline in China's coal usage.

China is the world's biggest producer and consumer of coal, using this resource for 59% of its energy in 2018. As well as running power plants and other heavy industries, coal is also the sole heat source for millions of homes in the vast rural areas of the country.

Source: https://edition.cnn.com/2020/03/16/asia/china-pollution-coronavirus-hnk-intl/index.html