With so many people staying inside, new data shows air pollution is declining. But that does not mean there is a lower risk of contracting the coronavirus.

Duran Fiack, a professor at Lehman College, says nitrous dioxide emissions are often associated with automobile emissions or fossil fuel combustion.

Dr. Fiack, who has a focus on environmental studies, wants people to remember they still need to protect themselves from the coronavirus.

He says during the last recession in the late 2000s, there was a decline in CO2 emissions, but as the economy recovered, that changed.