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New Delhi, Jul 18: The Covid-19 lockdown-led reduction in air pollution levels across five Indian cities, including Delhi and Mumbai, may have prevented about 630 premature deaths, and saved USD 690 million in health costs in the country, according to a new study.

Scientists, including those from the University of Surrey in the UK, assessed the levels of harmful fine particulate matter (PM2.5) from vehicles and other sources in five Indian cities -- Delhi, Mumbai, Kolkata, Chennai and Hyderabad -- since the beginning of the lockdown period.

The study, published in the journal Sustainable Cities and Society, compared these lockdown PM2.5 figures from 25 March up until 11 May, with those from similar periods of the preceding five years, and found that the measure reduced pollution levels in all these places.

According to the scientists, during this period, the levels of these harmful air pollutants reduced by 10 per cent in Mumbai, and by up to 54 per cent in Delhi.

"The percentage reduction for the other cities ranged from 24 to 32 per cent, which was slightly smaller than the measured values for Delhi and Mumbai," the scientists noted in the study.

"While the reduction in PM2.5 pollution may not be surprising, the size of the reduction should make us all take notice of the impact we have been having on the planet," said Prashant Kumar, a co-author of the study from the University of Surrey.

The scientists said these reductions in PM2.5 were comparable to those reported in other cities across the world, such as in Austria's capital Vienna (60 per cent), and Shanghai (42 per cent) in China.

They also calculated the monetary value of the reduced mortality due to air pollution and found that the lowered levels of PM2.5 may have saved 630 people from premature death, and USD 690 million in health costs in India.

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According to the researchers, the present lockdown situation offers observational opportunities regarding potential control systems and regulations for improved urban air quality.

They said an integrated approach might help in understanding the overall impacts of Covid-19 lockdown-style interventions and support the implementation of relevant policy frameworks.

"This is an opportunity for us all to discuss and debate what the 'new normal' should look like - particularly when it comes to the quality of the air we breathe," Kumar said.

New Delhi, May 27: Professor Johan Giesecke of the Karolinska Institute, Sweden, on Wednesday claimed that India will ruin its economy very quickly if it had a severe lockdown.

Claiming that a strict lockdown may disrupt India's economic growth, Giesecke during an interaction with Congress leader Rahul Gandhi said: "In India, you will do more harm than good with strict lockdown measures. India will ruin its economy very quickly if it had a severe lockdown."

While calling for a soft lockdown approach in India, he suggested that India has to ease restrictions one by one. It may, however, take months to completely come out of lockdown, he said.

He further criticised countries across the globe for having no post-lockdown strategy.

Emphasising on the disease, the Swedish health expert said that coronavirus is spreading like a wildfire across the world. "It is a very mild disease. Ninety-nine per cent infected people will have very less or no symptoms," he added.

Meanwhile, Ashish Jha, Director Harvard Global Health Institute and a recognised public health official, in interaction with Gandhi, called for a need to go in for an 'aggressive' COVID-19 testing to create confidence among people.

"When the economy is opened post-lockdown, you have to create confidence. There is a need for aggressive testing strategy in high-risk areas," he said.

He asserted that COVID-19 is not the last pandemic in the world, adding that "We are entering the age of large pandemics".

Jha further said that countries like South Korea, Taiwan and Hong Kong have responded the best to COVID-19 pandemic, while Italy, Spain, the US and the UK have responded the worst.

A few days ago, the Gandhi scion had interacted with former Reserve Bank of India Governor Raghuram Rajan and Nobel Prize Winner Abhijit Banerjee to discuss various issues related to the COVID-19 crisis.