A woman wearing a face mask as a preventive measure against the COVID-19 coronavirus crosses a street in Beijing.

A man wearing a face mask as a preventive measure against the COVID-19 coronavirus cycles on a nearly empty street in Beijing.

Tens of thousands of lives have been saved due to reduced air pollution during coronavirus lockdowns, research shows.

Air quality expert Marshall Burke estimates that in China alone, dwindling harmful emissions “have saved the lives of 4,000 kids under five and 73,000 adults over 70.”

But, Burke warned that while his calculations “yield some very large reductions in premature mortality it seems clearly incorrect and foolhardy to conclude that pandemics are good for health.”

The Stanford University researcher explained that the positive effects he’s calculated “are just the health benefits of the air pollution changes”.

There has obviously been massive disruption to every day life, with the coronavirus pandemic severely hitting economies from China to the UK, alongside thousands of deaths worldwide.

Italy’s toll alone has already surged past 2,500 people.

And the latest worldwide figures show that as of today, a terrifying 201,530 have been infected globally, while 8,007 have been killed by the new virus.

Burke said that his stats “do not account for the many other short- or long-term negative consequences of social and economic disruption on health or other outcomes.

“These harms could exceed any health benefits from reduced air pollution.

“But the calculation is perhaps a useful reminder of the often-hidden health consequences.”

His concerns are echoed by Gernot Wagner, a clinical associate professor at New York University’s Department of Environmental Studies.

He told MIT Technology Review: “Emissions in China are down because the economy has stopped and people are dying and because poor people are not able to get medicine and food.

“This is not an analogy for how we want to decrease emissions from climate change.”

China, where the outbreak started, showed a marked reduction in pollution after the government imposed travel bans and quarantines.

CO2 emissions fell by a quarter, or an estimated 200 million tonnes in the four weeks to March 1 – about half the amount Britain emits in a year.

And the data from Italy, which was hit hard several weeks later, has suggested a similar pattern.

Air pollution has plummeted over northern Italy after the government introduced a nationwide lockdown to combat coronavirus, satellite imagery shows.

An elderly Milan resident told The Sun Online that with Italy “almost totally locked down to contain the virus, roads are empty and there’s a lot of silence”.

The grandad added: “One positive aspect of this situation is that the air quality in Milano is a lot better.”

Italy’s mass quarantining of its population has involved complete self-isolation.

It has closed all schools, offices and services and ordered everyone without a compelling and authorized reason to stay home.

The new coronavirus first appeared in Italy in January, but the outbreak surged dramatically in February in the small town of Codogno, about 60km (40miles) southeast of Milan.

Italian doctors have warned of a “catastrophic” situation, as more than 31,000 cases have been confirmed.

The European Space Agency (ESA) said it had noticed a particularly marked decline in emissions of nitrogen dioxide (N02) – a noxious gas emitted by power plants, cars and factories – over the Po Valley region in northern Italy.

Claus Zehner, who manages the agency’s Copernicus Sentinel-5P satellite mission, said: “Although there could be slight variations in the data due to cloud cover and changing weather, we are very confident that the reduction in emissions that we can see coincides with the lockdown in Italy causing less traffic and industrial activities.”

Lower pollution emissions are also being recorded across Britain, as people work from home and stay clear of public transport and roads in an effort to stifle the spread of the killer bug.

The number of flights has also been slashed in the UK.

Ryanair, for example, has warned that it might be forced to ground all of its flights as Europe becomes the “coronavirus epicentre”.

The airline said in a statement: “For April and May, Ryanair now expects to reduce its seat capacity by up to 80 percent and a full grounding of the fleet cannot be ruled out.”

EasyJet is grounding 100 aircraft across Europe, British Airways intends cutting 75 percent of flights in April and May, Norwegian is canceling 85 percent of flights and Virgin Atlantic is scrapping 80 percent of flights by March 26.

Marshall Burke said that “in a few years, there will likely be enough data to actually try to measure what the overall effect was of the Covid-19 epidemic on health outcomes.”

Up until the coronavirus hit China at the end of last year nine out of ten people on the planet were breathing polluted air.