1. Skip to content
  2. Skip to main menu
  3. Skip to more DW sites
NASA's satellite images of China
Image: picture-alliance/dpa/NASA

China: Satellite photos show huge pollution decline

March 1, 2020

Scientists attribute the decrease to the economic slowdown in China due to coronavirus. Factory and business closures for the Lunar New Year could also have contributed to the 'dramatic drop-off.'


Satellite images issued by NASA have shown a dramatic decline in pollution levels across China, which is "at least partly" due to an economic slowdown following the outbreak of the new coronavirus, the space agency said on Sunday.

NASA and the European Space Agency (ESA) pollution monitoring satellites reportedly detected significant decreases in nitrogen dioxide (NO2) over China.

Calls for free speech in China

Read moreA new generation of 'hyper' satellites to prevent a climate catastrophe 

The images show concentrations of nitrogen dioxide, "a noxious gas emitted by motor vehicles, power plants and industrial facilities," according to NASA.

The reduction in NO2 pollution was first apparent near Wuhan, the city at the center of the COVID-19 outbreak in China, according to NASA scientists, but eventually spread across the country.

Millions of Chinese citizens have been quarantined, and cities placed in lockdown since the start of the novel coronavirus outbreak.

"This is the first time I have seen such a dramatic drop-off over such a wide area for a specific event," Fei Liu, an air quality researcher at NASA's Goddard Space Flight Center, said in a press release. He added that he had seen a drop in pollution levels in several countries during the 2008 economic recession, but the decrease had been gradual.

Read moreChina’s economic woes threaten to derail climate actions

Similar effects were also observed around Beijing during the 2008 Olympics, but they were mostly seen around the city.

China's Lunar New Year celebrations in February have also been linked to similar decreases in pollution levels. Businesses and factories typically close ahead of the festival, causing temporary reductions in pollution output.

Read moreEarth observation and citizen science — a match made in heaven 

"This year, the reduction rate is more significant than in past years and it has lasted longer," Liu said.

China has recorded nearly 85,000 cases of coronavirus since the outbreak began in December. Quarantines and lockdowns in a number of Chinese cities have trapped hundreds of millions indoors, while more than 2,900 people have died from COVID-19 worldwide.

Read moreCoronavirus: Can Traditional Chinese Medicine help fight the disease?

DW sends out a selection of the day's news and features. Sign up for it here.

lc/jlw (dpa)

Skip next section Explore more
Skip next section Related topics
Skip next section DW's Top Story

DW's Top Story

Site of a damaged apartment building in Kharkiv, Ukraine

Ukraine updates: Zelenskyy urges faster weapon deliveries

Skip next section More stories from DW
Go to homepage