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New Delhi, Jul 21: The Centre has written to all states and union territories warning against the use of N-95 masks with valved respirator by people, saying these don't prevent the virus from spreading out and are "detrimental" to the measures adopted for its containment.

The Director-General of Health Services in the Ministry of Health, in a letter to the Principal Secretaries of health and medical education of states, said it has been observed that there is "inappropriate use" of N-95 masks, particularly those with valved respirator, by the public other than designated health workers.

The DGHS referred to the advisory on the use of homemade protective cover for face and mouth available on the website of the Ministry of Health.

"It is to bring to your knowledge that the use of valved respirator N-95 masks is detrimental to the measures adopted for preventing the spread of coronavirus as it does not prevent the virus from escaping out of the mask. In view of the above, I request you to instruct all concerned to follow the use of face/mouth cover and prevent inappropriate use of N-95 masks," DGHS Rajiv Garg said in the letter.

The government had in April issued an advisory on the use of homemade protective cover for face and mouth, asking people to wear it, particularly when they step out of their residences.

The advisory stressed such face covers must be washed and cleaned each day, as instructed and states that any used cotton cloth can be used to make this face cover. 

The colour of the fabric does not matter but one must ensure that the fabric is washed well in boiling water for five minutes and dried well before making the face cover. Adding salt to this water is recommended, it said.

It also listed the procedures of making such homemade masks, asking to ensure it fits the face well and there are no gaps on the sides.

It urges people to wash hands thoroughly before wearing the face cover,  switching to another fresh one as the face cover becomes damp or humid, and never reusing it after single use without cleaning it. 

"Never share the face cover with anyone. Every member in a family should have separate face cover," the advisory stated.

New Delhi, Jun 17: Petrol and diesel prices were increased in metros on Wednesday, marking the eleventh straight day of increase since state-owned oil companies returned to the normal practice of daily reviews following a 12-week pause. With effect from 6 am, the price of petrol was increased by 55 paise per litre, and diesel by 69 paise per litre in Delhi, compared to the previous day. While the price of petrol was revised to Rs 77.28 per litre in the national capital from Rs 76.73 per litre the previous day, the diesel rate was increased to Rs 75.79 per litre from Rs 75.19 per litre, according to notifications from state-run Indian Oil Corporation, the country's largest fuel retailer. In the 11-day period, the price of petrol has been increased by a cumulative Rs 6.02 per litre, and diesel by Rs 6.49 per litre.

International crude oil prices retreated on Wednesday, weighed down by an increase in US crude inventories and worries about a potential second wave of the coronavirus pandemic. Brent crude futures - the global benchmark for crude oil - were last seen trading 1.0 per cent lower at $40.56 per barrel.

State-run oil marketing companies revise the prices of petrol and diesel from time to time, besides aviation turbine fuel (ATF) - or jet fuel - and liquefied petroleum gas (LPG). However, since March 16, the oil companies had kept petrol and diesel prices on hold, possibly due to the volatility in global oil markets.

Fuel retailing in the country is dominated by state refiners - Indian Oil Corporation, Bharat Petroleum Corporation and Hindustan Petroleum Corporation. The three own about 90 per cent of the retail fuel outlets in the country.