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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.

Coronavirus India update: State-wise total number of confirmed cases, deaths on July 17

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, May 6: The death toll due to COVID-19 rose to 1,694 and the number of cases climbed to 49,391 in the country on Wednesday, registering an increase of 126 deaths and 2,958 cases in the last 24 hours, the Union Health Ministry said.

The number of active COVID-19 cases is 33,514. A total of 13,160 people have recovered and one patient has migrated, it said.

"Thus, around 28.71 per cent patients have recovered so far," a senior health ministry official said.

The total number of cases include 111 foreign nationals.

A total of 111 deaths were reported since Tuesday evening, of which 49 fatalities were reported from Gujarat, 34 from Maharashtra, 12 from Rajasthan, seven from West Bengal, three from Uttar Pradesh, two each from Punjab and Tamil Nadu and one each from Karnataka and Himachal Pradesh, the ministry said.

Of the 1,694 fatalities, Maharashtra tops the tally with 617 fatalities. Gujarat comes second with 368 deaths, followed by Madhya Pradesh at 176, West Bengal at 140, Rajasthan at 89, Delhi at 64, Uttar Pradesh at 56 and Andhra Pradesh at 36.

The death toll reached 33 in Tamil Nadu, 29 in Telengana, while Karnataka has reported 29 fatalities.

Punjab has registered 25 COVID-19 deaths, Jammu and Kashmir eight, Haryana six and Kerala and Bihar four deaths each.

Jharkhand has recorded three COVID-19 fatalities.

Meghalaya, Chandigarh, Himachal Pradesh, Odisha, Assam and Uttarakhand have reported one fatality each, according to the ministry data.

According to the health ministry data updated in the morning, the highest number of confirmed cases in the country are from Maharashtra at 15, 525, followed by Gujarat at 6,245, Delhi at 5,104, Tamil Nadu at 4,058, Rajasthan at 3,158, Madhya Pradesh at 3,049 and Uttar Pradesh at 2,880.

The number of COVID-19 cases has gone up to 1,717 in Andhra Pradesh and 1,451 in Punjab.

It has risen to 1,344 in West Bengal, 1,096 in Telengana, 741 in Jammu and Kashmir, 671 in Karnataka, 548 in Haryana and 536 in Bihar.

Kerala has reported 502 coronavirus cases so far, while Odisha has 175 cases. A total of 125 people have been infected with the virus in Jharkhand and 111 in Chandigarh.

Uttarakhand has reported 61 cases, Chhattisgarh 59 cases, Assam 43, Himachal Pradesh 42 and Ladakh 41.

Thirty-three COVID-19 cases have been reported from the Andaman and Nicobar Islands.

Tripura has registered 43 cases, Meghalaya has reported 12 and Puducherry nine, while Goa has seven COVID-19 cases.

Manipur has two cases. Mizoram, Arunachal Pradesh and Dadar and Nagar Haveli have reported a case each.

"Our figures are being reconciled with the ICMR," the ministry said on its website.

State-wise distribution is subject to further verification and reconciliation, it said.

The Ministry of Health and Family Welfare has prepared a draft for guidelines for home quarantine, as well as for the use of masks by public, in view of coronavirus.

What to do in Home Quarantine?

The government says, for those taking refuge to home quarantine should stay in a well-ventilated single-room preferably with an attached or separate toilet. It adds that if another family member needs to stay in the same room, it's advisable to maintain a distance of at least 1 metre between the two.

The government advised, coronavirus patients to stay away from elderly people, pregnant women, children and persons with co-morbidities within the household as their immune system may be low. The health minister also suggested to restrict the patient's movement within the house. "Under no circumstances attend any social/religious gathering e.g. wedding, condolences, etc, said the guideline.

It also instructed the corona virus infected person to avoid sharing household items like dishes, drinking glasses, cups, eating utensils, towels, bedding, or other items with others at home. The guideline also demanded that even though home quarantine, the patient should wear a surgical mask at all times. "The mask should be changed every 6-8 hours and disposed off. Disposable masks are never to be reused, it added.

"Masks used by patients/ caregivers/ close contacts during home care should be disinfected using ordinary bleach solution (5 per cent) or sodium hypochlorite solution (1%) and then disposed of either by burning or deep burial," instructs the government.

Even for family members of a patient, the health ministry clearly instructs to use disposable gloves when cleaning the surfaces or handling soiled linen. No visitors, under any circumstances will be allowed, said the guideline.

"In case the person being quarantined becomes symptomatic, all his close contacts will be home quarantined (for 14 days) and followed up for an additional 14 days or till the report of such case turns out negative on lab testing," states the draft.

How to wear & dump masks?

There is a specific and elaborate do's and don'ts also released by the ministry. For those unsure in which mask to choose, it says, "Medical masks of different sizes and shapes are available in the market. The common ones are flat pleated masks of woven fabric which covers the nose and mouth and affixed behind the head with straps/ elastic fasteners. There are also conical or duck bill shaped masks with valves (or without valves) that fit in the contour of face over the nose and mouth, but are costlier."

However, the ministry warns, medical masks should not be used by healthy persons who are not having any symptoms "because it creates a false sense of security". Instead, it suggests to refrain from touching face, mouth, nose and eyes as well as washing hands regularly with soap for 20 seconds each time.

However, when a person develops a cough or fever, the suspected patient needs to switch to medical masks. "Use of medical three layer masks when ill, will prevent your infection from spreading to others. However you also need to wash your hands frequently to avoid spreading infection to others," read the guideline.

Even if one is not tested positive but showing symptoms, they are advised to wear masks while visiting a healthcare facility. "Close family contacts of such suspect/confirmed cases undergoing home care should also use Triple layer medical mask," it warns.

The ministry has also given point by point guideline on how to use a mask like to make sure that they are facing down while unfolding or for that matter to ensure there are no gaps on either side of the mask.

It even warns, "Fit flexible nose piece (a metallic strip that can easily be located) over nose-bridge" to ensure no one else are infected. The government also warns against simple dumping of the masks once used. Instead one should disinfect "using ordinary bleach solution (5 per cent) or sodium hypochlorite solution (1 per cent) and then disposed of either by burning or deep burial," says the Health Ministry.

COVID-19 emerged in early December 2019 in China's Wuhan province and has now spread to over 100 countries. As on March 9, 2020, India has reported 42 cases mostly among those who had travelled from affected countries.

However the government says, "It causes a minor illness in majority of patients with symptoms of fever and or cough. A small proportion of such persons may progress to severe disease with difficulty in breathing."