Looks like a side effect of the virus is an improvemnet in pollution levels.
A pair of images captured by NASA and European Space Agency pollution monitoring satellites reveal a significant change in nitrogen dioxide (NO2) levels in the air over China between Jan. 1 and Feb. 25.
![](https://wordpress.accuweather.com/wp-content/uploads/2020/03/china_trop_2020056-1.png?w=632)
The first image, depicting the period from Feb. 1-20, features large pockets of orange and red, which represent a high density of NO2 over metropolitan areas like Beijing, Shanghai and Hong Kong.
The timeline for the improvement in air quality coincides with when health and government officials in China acknowledged the threat of coronavirus and put Wuhan, the epicenter of the outbreak, on lockdown.
NO2 is emitted by motor vehicles, power plants and industrial facilities - and the quarantine placed on the city shut most of these things down, likely leading to the improved air quality.
According to NASA, the reduction in NO2 pollution was first apparent near Wuhan but eventually spread across the country.