Coronavirus London: Tube and bus passengers may be told to wear higher-grade anti-Covid masks

Tube and bus passengers may be told to switch to higher-grade masks to guard against mutant strains of Covid-19, it has been revealed.

The London Mayor and Transport for London launched two reviews of the current guidance as the ‘Kent strain’ continued to spread through the UK.

Cloth masks and DIY bandanas are useful for lessening the spread of the virus caused by cough droplets and sneezes, but they do not stop inhalation of virus particles, reported the Evening Standard.

Other countries, including Germany and France, have already asked citizens to wear high-filtration masks to keep the spread of coronavirus at a minimum.

They are disposable, slightly more expensive and more difficult to breathe through. But they also stop 95 per cent of airborne particles – drastically reducing a passenger’s likelihood of testing positive. 

A spokesperson for Sadiq Khan said: ‘Germany, France and Austria have all recently introduced stricter requirements for face coverings, and it may be necessary to introduce tougher measures here to stop the spread of the new variant, particularly in poorly ventilated locations.’

The London mayor will commission an analysis of the situation from the city’s scientific advisory group on coronavirus.  

TfL staff already wear a four-layer surgical mask but the advice to passengers could now change to offer them more protection.

In Germany, single-use surgical FFP1 masks or more protective FFP2 filtering respirators should be worn in the workplace, on public transport and in shops since a ruling last month.

And France banned some DIY coverings because they didn’t offer enough protection.

Tom Frieden, former director of America’s Centers for Disease Control and Prevention, said: ‘The existence of more-transmissible viruses emphasizes the importance of us upping our game and doing not more of the same but better of the same.’ 

The good face-mask guide: As UK health officials consider urging everyone to cover their mouths MailOnline reveals the best from top surgical-level respirators costing £20 each or ten mouth covers for £1 each 

By Mark Duel for MailOnline 

Face masks have been a common sight in the UK since Britons were asked to wear them on public transport and inside public buildings.  

In countries such as China, Japan and South Korea, wearing face masks when you’re ill is common – East Asia has learned from deadly virus outbreaks in the past.

The West, however, was new to the idea and the coronavirus pandemic has triggered widespread use of face coverings across the globe. 

For weeks at the outset of the pandemic the Government told people not to bother with them to make sure there were enough available for staff in hospitals and care homes who really needed them.

Following a World Health Organization softening on the stance, however, they soon started recommending face coverings to prevent the spread of COVID-19.

Although it is acknowledged that they don’t do much to stop someone catching the virus, there is evidence they stop already-infected people spreading it. 

Here is what you need to know about the types available and their relative effectiveness: 

Two types of mask meet high-grade medical standards – FFP3 and FFP2/N95. So what’s the difference? 

The two main types of medical-grade face mask on sale in Britain are the FFP3 and FFP2, also known as N95, masks.

These are the types that doctors and nurses must use when treating patients with the coronavirus, and offer the most protection against viruses in the air.

They are particularly vital during ‘aerosolising’ procedures such as putting in a ventilator, which is when medical workers are most at risk of breathing in viruses.

FFP stands for Filtering Face Piece, with FFP3 giving the highest level of protection against virus and bacterial infections, while FFP2 is the level below.

NHS guidance is for medics to use the FFP3 masks, while FFP2 is recommended by the World Health Organization and is the equivalent to the US’s N95 mask.

The N in N95 stands for Not resistant to oil – because the mask is a particle respirator only and doesn’t protect against fluids – while the 95 means it filters out 95 per cent of airborne particles. 

Health officials say that when FFP3s are not available, FFP2s can be used. The WHO recommends FFP2 and N95 respirators, which are widely used in other countries.

The N95 does not have the CE mark to show compliance with European safety standards, but has been tested against standards similar to these requirements. 

What types of masks can you buy online and how much do they cost?

High-grade dust masks now used on NHS frontline: FFP3 face masks cost £40 for two

FFP3 masks are the gold standard for preventing the spread of airborne illnesses in hospitals.

They must fit tightly to the face and have all air drawn through a filter that is embedded in the fabric and catches almost every kind of particle as the air flows through. 

They are primarily used as dust masks in the construction industry.

The masks are not widely available to members of the public online.

The top listing on Amazon – made by Wrexham-based company Toolpak – has sold out both on the marketplace and the firm’s own website.

Silver standard masks used by medical workers in US and UK: N95/FFP2 face mask cost £6.99 each  

The N95 face mask is the US equivalent of the FFP2 mask in Europe and is backed by the World Health Organisation as suitable for medical use.

Its filter is not as strong as the FFP3 – it weeds out 95 per cent of particles, as the name suggests – but it is still highly rated for NHS staff.

UK health officials say FFP2 masks are second best to FFP3, and should be used if possible because they have a European seal of approval, but N95, which doesn’t have CE approval, can be used if no FFP2 masks are available.

Masks of this grade are more readily available online from sellers in China.

The Amazon bestseller is a N95 mask sold by HJHY, a company based in China. They cost £6.99. 43 per cent of people who bought the mask rated it just one star out of five.   

Another product in Amazon’s bestseller category is a £25.99 six-pack of N95 masks made by 3M and sold by Hpparty, another company based in China.

Disposable surgical masks still used in most NHS hospitals: Ten for £9.39 

The best known type of medical face mask, known as a surgical mask, is still being widely used by the NHS.

Doctors, nurses and healthcare workers are now instructed to wear these types of mask as a minimum at all times when working near confirmed or suspected coronavirus patients.

They are considered effective enough for most staff outside of intensive care or who are not inserting or removing breathing equipment.

Although they don’t have built-in air filters, the masks can stop droplets of liquid, which are how the majority of the COVID-19 viruses are spread.

The best-selling product of this type under ‘masks and respirators’ on Amazon today is a ten-piece set of disposable face covers which costs £9.39. 

The mask – with an average review rating of 3.5 stars – has an inner layer of cotton fabric, a middle layer of medical filter paper and an outer layer of waterproof fabric. It is sold by a company in London and delivers in early May.  

Another top seller is a pack of 20 costing £7.97 and shipping from a company called T-Shell in Guangdong, China. 

These types of masks are typically not reusable and should only be used for one day at a time.

Cycling masks designed to filter out pollution but with potential to stop viruses: £7.57 for six

While cycling masks remain untested regarding coronavirus, they are intended to provide a layer of protection from airborne particles.

They are designed to stop cyclists breathing in pollution when they ride through areas with heavy traffic.

They contain an air filter for this purpose, but are not regulated to the same standard as medical face masks so provide varying levels of protection.

High quality cycling masks, such as those made by the well-known UK brand Cambridge Mask Co. cost upwards of £20 and are reusable. 

Other cycling masks are available on Amazon, with the site’s bestseller a £7.57 pack of six from a company called Diyii in China. The firm says the masks are good for those with sensitive skin allergies and can be washed repeatedly, and are also suitable for camping, running, travel and climbing. 

Another top seller on the marketplace is a reusable mask sold by the Chinese firm KZKR-EU which costs £11.99 per mask and claims it will deliver within two weeks. 

The dramatic option: Respirator gas mask costing £34.86 for one

Perhaps the most dramatic-looking option of all masks is the gas mask respirator.

These are generally used by people spraying paint or other chemicals which it would be dangerous to inhale, or working in hazardous environments.

The masks have built-in valves fitted with filters which may be able to keep out droplets carrying the coronavirus.

The top listing on Amazon is a mask costing £34.86 and sold by SafeYear, a company based in Shanghai, China.

The mask is rated FFP3, meaning it would be suitable for even the riskiest medical procedures. 

Another top listed option on the site is a full-face rubber-sealed black mask which costs £29.87.

It is sold by the company Maikoler, based in China. 

T-shirts, bandanas and even sanitary towels: Homemade face masks may offer protection, too

Many people are opting to make masks at home using cloth or other materials – some have even been pictured using sanitary towels.

The Centers for Disease Control and Prevention (CDC) in the US recommends people use cloth face coverings when they go out in public and even has a how-to guide for people to make their own out of t-shirts or bandanas.

The intention of these is not specifically to protect people from catching the virus but to prevent the spread of it by encouraging such widespread use that people who are infected but don’t know about it wear something that blocks the viruses being expelled on their breath. 

However, European researchers have suggested these may not be effective and up to 90 per cent of particles can make their way through the fabric.

The European Centre for Disease Prevention and Control said rates of illness were much higher among healthcare staff using masks made out of cloth instead of surgical masks.

It said: ‘Altogether, common fabric cloth masks are not considered protective against respiratory viruses and their use should not be encouraged.

‘In the context of severe personal protective equipment (PPE) shortages, and only if surgical masks or respirators are not available, homemade cloth masks (e.g. scarves) are proposed as a last-resort interim solution by the US CDC until availability of standard PPE is restored.’