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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, Feb 6: DMK Lok Sabha member M K Kanimozhi on Wednesday challenged popular actor Rajinikanth to raise his voice for Muslims, saying they have "already been affected" by the Citizenship (Amendment) Act and are protesting on streets against the law.

Reacting to his statements earlier in the day in Chennai that "CAA is no threat to Muslims" and "if they face trouble I will be the first person to raise voice for them," Kanimozhi, daughter of former Tamil Nadu Chief Minister M Karunanidhi, told news agency that "Muslims in India have already been affected due to CAA".

"Let him (Rajinikanth) come forward and raise his voice for the affected Muslims", she said.

She said the members of the community have been protesting as the law leaves out Muslims.,

Asked whether Rajinikanth, through this pro-CAA statement, was moving closer to the BJP, the MP from Tuticorin said, "What he has said is no different from the BJP's narrative which we have been listening in parliament for the last few days".

Under CAA, members of Hindu, Sikh, Buddhist, Jain, Parsi and Christian communities who came to India from Pakistan, Bangladesh and Afghanistan till December 31, 2014, to escape religious persecution there will not be treated as illegal immigrants, and be given Indian citizenship.

Rajinikanth had asserted that the legislation did not pose any threat to Muslims. He wondered as to how Muslims, who chose to stay back in India following Partition will be sent out of the country. Besides, the central government had assured that Indian people will have no issues in view of CAA, he noted.

He charged that some political parties were instigating people against the CAA for their selfish interests.