Some face coverings are not as effective as others - this is what a study by Oxford University found

manchestereveningnews.co.uk:

hereBut the study shows that some coverings are not as effective as others. Loosely woven fabrics, such as scarves have been shown to be the least effective.While it is already mandatory for passengers to wear a covering on public transport in England, shoppers will have to do so from July 24.Health Secretary Matt Hancock said in a statement on Tuesday that anyone failing to comply with the order could face a fine up to £100.The move follows a weekend of confusion over whether ministers intended to make face coverings compulsory after Boris Johnson said they were looking at “stricter” rules.The senior Cabinet Office minister Michael Gove said on Sunday he did not believe they should be mandatory and that it was better to “trust people’s.