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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, Apr 15: The Union Health Ministry has identified 170 districts as COVID-19 hotspots and 207 districts as potential hotspots, officials said on Wednesday, reiterating that there has been no community transmission of the disease in the country so far.

Addressing the daily briefing to provide updates on coronavirus situation in the country, Joint Secretary in the Ministry of Health Lav Agarwal said that states have been asked to classify districts which have reported a higher number of cases as hotspots, the districts where cases have been reported as non-hotspots, and green zones where no cases have been reported.

"Hotspots are those districts which are reporting more number of cases or where the rate of growth of COVID-19 cases is high," Agarwal said, adding a detailed direction has been issued to states stating consolidated efforts are required to utilise this period of lockdown to curb the spread of the virus.

"Cabinet secretary held a video conference today with all chief secretaries, DGPs, health secretaries, collectors, SPs, municipal commissioners and CMOs where hotspots were discussed and orientation on field level implementation of containment strategy was given.

"They were told about large outbreak containment strategies, cluster containment strategies. Delineation of buffer and containment zone, parameter mapping, defining of entry and exit points were also discussed in detail," he said.

The joint secretary said movement of people will not be allowed in containment zones except for those related with essential services and special teams will search for new cases and samples will be collected and tested as per sampling criteria.

The officials said that health facilities in buffer zone outside the containment zone will be oriented and people facing SARI and influenza-like symptoms will be tested there.

"Special teams have been formed which will work in containment zone and do contact tracing and house-to-house surveys. Cases of fever, cough and breathlessness will be identified in the survey and requisite action will be taken as per protocol," Agarwal said, adding that there has been no community transmissions so far but some local outbreaks.

The total number of COVID-19 cases in India has risen to 11,439 with 1,076 fresh cases reported in the last 24 hours while the death toll stands at 377, the ministry official said.