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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.

Mar 4: Prime Minister Narendra Modi said on Wednesday that he has decided not to participate in any 'Holi Milan' programme as experts have advised reducing mass gatherings to avoid the spread of coronavirus.

"Experts across the world have advised reducing mass gatherings to avoid the spread of COVID19 Novel Coronavirus. Hence this year, I have decided not to participate in any 'Holi Milan' programme," the PM tweeted.

This year, Holi is on March 10.

Kolkata, Jan 28: West Bengal chief minister Mamata Banerjee Tuesday said she is ready for talks with Prime Minister Narendra Modi on the issue of Citizenship Amendment Act but the Centre has to first withdraw the contentious law.

Banerjee said protesting against the decisions of the centre doesn't make opposition parties anti-national and iterated that she will not implement CAA, NRC or NPR in the state.

"It is good that the prime minister is ready for talks but the Citizenship Amendment Act (CAA) must be revoked first. They (Centre) did not call an all-party meeting before taking a decision on Kashmir and CAA.

"We are ready for talks but first withdraw this Citizenship Amendment Act," Banerjee, a staunch critic of the BJP, said addressing a protest programme against CAA through paintings.

The West Bengal assembly had on Monday passed a resolution against the CAA to become the fourth state after Kerala, Punjab and Rajasthan, to do so. The state assembly had on September 6, 2019, passed a resolution against the NRC.