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Nitrogen dioxide levels fell by more than 70% during COVID-19 lockdown in New Delhi: UN

Nitrogen dioxide levels fell by more than 70% during COVID-19 lockdown in New Delhi: UN

Levels of nitrogen dioxide fell by more than 70 per cent during the lockdown in New Delhi, a UN policy brief said on Tuesday, warning that the environmental gains could be temporary if the cities re-open without policies to prevent air pollution and promote de-carbonisation.