Scientists say that by May, when carbon dioxide emissions are at their peak thanks to the decomposition of leaves, the levels recorded might be the lowest since the financial crisis over a decade ago.
Researchers in New York told the BBC their early results showed carbon monoxide mainly from cars had been reduced by nearly 50% compared with last year.
Both China and Northern Italy have also recorded significant falls in nitrogen dioxide, which is related to reduced car journeys and industrial activity. The gas is both a serious air pollutant and a powerful warming chemical.
But there are warnings levels could rise rapidly after the pandemic. "Governments now have to be really cautious on how they re-stimulate their economies, mindful of not locking in fossil fuels again," said Prof Le Quéré from the University of East Anglia.
"They should focus those things that are ready to go that would lower emissions, like renovating buildings, putting in heat pumps and electric chargers. These are not complicated and can be done straight away, they are just waiting for financial incentives."
Both China and Northern Italy have also recorded significant falls in nitrogen dioxide, which is related to reduced car journeys and industrial activity. The gas is both a serious air pollutant and a powerful warming chemical.
But there are warnings levels could rise rapidly after the pandemic. "Governments now have to be really cautious on how they re-stimulate their economies, mindful of not locking in fossil fuels again," said Prof Le Quéré from the University of East Anglia.
"They should focus those things that are ready to go that would lower emissions, like renovating buildings, putting in heat pumps and electric chargers. These are not complicated and can be done straight away, they are just waiting for financial incentives."
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