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Infrastructure Minister Nichola Mallon wears a face mask, which are mandatory on public transport in Northern Ireland (Liam McBurney/PA)

Infrastructure Minister Nichola Mallon wears a face mask, which are mandatory on public transport in Northern Ireland (Liam McBurney/PA)

PA

Boris Johnson, wearing a face covering, elbow bumps an employee during a visit to the London Ambulance Service (Ben Stansall/PA)

Boris Johnson, wearing a face covering, elbow bumps an employee during a visit to the London Ambulance Service (Ben Stansall/PA)

PA

Infrastructure Minister Nichola Mallon wears a face mask, which are mandatory on public transport in Northern Ireland (Liam McBurney/PA)

Wearing face masks on public transport has now become mandatory in Northern Ireland, and Infrastructure Minister Nichola Mallon has warned police could be called for those not wearing coverings.

To offer some clarity on how commuters can protect themselves from both the virus and the law - here is everything you need to know about making the most of the low-tech defence.