Delhi’s Nitrogen Dioxide Levels Fell by Over 70% During COVID-19 Lockdown: UN

The UN policy brief stated that Levels of nitrogen dioxide fell by more than 70% during the lockdown in New Delhi.
The environmental gains could be temporary if the cities re-open without policies to prevent air pollution and promote de-carbonization.
It also stated that nitrogen dioxide fell 40% in urban areas in China, 20% in Belgium and Germany, and 19-40% in different areas of the US.
The UN's Policy on 'Covid-19 in an Urban World' stated that with an estimated 90% of all reported Covid-19 cases, urban areas have become the epicentre of the pandemic. It also pointed out that several new scientific studies suggest that poor air quality is correlated with higher Covid-19 mortality rates.
Nitrogen dioxide (N2O) is one of a group of gases called nitrogen oxides. Nitrogen dioxide is naturally formed in the atmosphere by lightning and some are produced by plants, soil, and water.