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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, Dec 24: The Delhi Police said that a head constable was killed during clashes over the Citizenship Amendment Act (CAA) in northeast Delhi today.

Deputy Commissioner of Police, Shahdara, Amit Sharma was also injured during clashes, a senior official said. Sharma suffered injuries to his head and hand. He was hospitalised and is doing fine, the official added.

Tension escalated in northeast Delhi with protesters torching at least two houses and a fire tender in the Jaffrabad and Maujpur areas, where pro and anti-CAA groups clashed for the second consecutive day on Monday and hurled stones at each other.

Violence was also reported from the Chandbagh area in Jaffrabad.

Police fired tear gas shells and also resorted to lathicharge to disperse the protesters.

According to officials, a fire tender was damaged by the protesters after it responded to a fire call in the area.

The Delhi Metro closed entry and exit at the Jaffrabad and Maujpur-Babarpur stations as an uneasy calm prevailed in the area.

"Entry & exit of Jaffrabad and Maujpur-Babarpur are closed. Trains will not be halting at these stations," the Delhi Metro Rail Corporation (DMRC) said in a tweet.

Entry and exit were closed at the Jaffrabad metro station for over 24 hours.

Clashes broke out on Sunday evening between pro and anti-CAA groups near Jaffrabad after a large number of people protesting against the Citizenship (Amendment) Act (CAA) blocked a road, while similar sit-ins were launched in several other parts of the national capital.

Delhi chief minister Arvind Kejriwal has urged lieutenant governor of Delhi and the Union home minister to restore order.

Nobody should be allowed to orchestrate violence, he said.

Delhi Lt Governor Anil Baijal instructed the police commissioner to maintain law and order in the national capital in the wake of violence.

"Instructed @DelhiPolice and @CPDelhi to ensure that law and order is maintained in North East Delhi. The situation is being closely monitored. I urge everyone to exercise restraint for maintenance of peace and harmony," Baijal tweeted.

Delhi minister and Babarpur MLA Gopal Rai on Monday urged the people in the area to maintain peace, saying some people were purposely trying to disturb the atmosphere.

"With folded hands, I request people in Babarpur Assembly to maintain peace. Some people are purposely trying to spoil the atmosphere. I have spoken to Delhi LG and he has assured me that more policemen will be deployed to bring the situation under control," Rai said in a tweet.

Jammu, Jan 18: Prepaid mobile connections were restored in Jammu and Kashmir on Saturday and 2G services resumed in two districts of the valley after being disconnected on August 5 last year. Voice and SMS facilities were restored for all local prepaid mobile phones across the Union territory.

Rohit Kansal, the principal secretary to the administration of Jammu and Kashmir said the order will come into effect from Saturday.

In order to consider giving mobile Internet connectivity on such SIM cards, the telecom service providers will have to verify the credentials of the subscribers, he said.

Internet service providers have been asked to provide fixed line Internet connectivity in all the 10 districts of Jammu region and two districts, Kupwara and Bandipora, in North Kashmir.

Telecom services were shut in the entire Jammu and Kashmir on August 5 when the Centre abrogated special status to the erstwhile state and also bifurcated it into two Union Territories.

However, the Supreme Court came down heavily on the UT administration last week for arbitrarily shutting down the Internet, the facility described as the fundamental right by the apex court.