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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.

Panaji, Jan 28: Bureaucrat-turned-activist Kannan Gopinathan on Tuesday said even some "RSS people" are convinced the Citizenship Amendment Act is a bad law but are keeping quiet as the NDA government at the Centre is their own baby.

Speaking in Panaji, he further said the Narendra Modi government was behaving like a "drunken teenager" which needs to be questioned or else it will end up destroying homes.

"I was detained twice in UP, kept the whole day, because they (government) do not want the questioning (of CAA). I have met so many RSS people, they also understand this...if you have this conversation, they also understand the government has done something (wrong) and they have been asked to support it," he claimed.

He said the line of thought among these RSS people (he met) was "just support it (CAA)" as they don't want an altercation because the "government is their baby".

"He (government) is not a normal baby, he is a drunken teenager. He should be asked questions because when he starts destroying, he does not destroy somebody else's home but your own home," Gopinathan said.

He also hit out at those who have been claiming that the people protesting against the CAA are unaware about the law and have not even read it.

Gopinathan claimed if one had asked supportive MPs about the CAA on the day it was passed in Parliament, several of them would not have been able to speak on it as "they would not have known what was passed, because they were not given time (to go through the bill)".

He said, earlier, such legislation was passed after several rounds of consultation but "now, by night, it becomes an Act", adding (now) "everything is a surgical strike".

Gopinathan, in a possible reference to the National Register of Citizens exercise carried out in Assam, also claimed "thousands of people are in detention centres".

"It is your fundamental right to peacefully assemble without arms, Article 19 (1) (D) (of the Constitution)," he said at a function organised by a group opposed to CAA.

Gopinathan said people "always felt they were in a democracy" because they never tried to fly, when in reality "you are in a cage".

"The moment you want to fly you realise you are in a cage," he said, adding that "we have to question, we have to ask ourselves where are we going".

"When you don't allow a person to speak against an incorrect legislation, then what is democracy? What is freedom of expression?" Gopinathan questioned.

Gopinathan, a 2012 batch AGMUT cadre Indian Administrative Service officer, was the secretary, Power Department of the Union Territories of Daman and Diu, and Dadra and Nagar Haveli when he resigned on August 21 last year.

At the time, he had claimed the people of Jammu and Kashmir were being denied freedom of expression following abrogation of Article 370 by the Centre.