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.
Steaming up spectacles:
This is the bane of people who wear glasses - the lenses steam up and they can find it difficult to see. The tip is to put the glasses into soapy water and allow them to dry on their own.
This helps to create an anti-fog layer. Others try to position them lower on the nose.
Where to carry a mask:
We have all seen people taking masks out of their pocket or bag without any wrapping or covering.
A mask must be kept clean and it should be kept in a plastic or paper bag for infection-control purposes.
Can you wear a disposable mask more than once?
A disposable mask should only be worn on one occasion.
If you want a covering that can be reused the recommendation is to use a cloth mask and this can be washed. It's possible to put it in with the laundry but the key is to use some kind of detergent to destroy the lipid layer around the virus.
Can I use a scarf as a mask?
Experts say using a scarf is better than wearing nothing but it may not provide much protection, particularly if it is a thin neck scarf.
If the fabric is too thick, it is difficult to make several comfortable layers that would be bearable on a long journey.
What about layering a mask?
If people make their own mask the advice is to have a minimum of three layers of fabric.
Aim for two layers of a cloth such as cotton with a filter between them made of different material. This can include a piece of paper towel or silk.
If you make a pocket in the middle of the mask the paper towel slip can be changed every time it is washed.
How do I fit my mask properly?
Have it tightly fitting in order to block droplets coming from the mouth.
It also needs to fit around the chin and cheeks. Shop-bought masks have a mouldable nose-piece which can be squeezed around the nose to anchor it.
For home-made versions the recommendation is to use a paper clip or pipe cleaner.
Do I need to clean my hands before donning the mask?
This is important and if you are at a bus stop or railway platform there is unlikely to be access to a sink. Hand sanitiser should be used instead.
The advice is try not to touch the mask area and only touch the straps around the ears. Wearing the same mask all day: Once it becomes damp it is less effective and can also cause skin irritation.
What are the most effective masks?
Medical masks are regarded as best in not just reducing respiratory droplets from the wearer to others but also in preventing transmission of the virus from others to the wearer.
Also known as surgical masks, they are made from a minimum of three layers of synthetic non-woven materials.
They are available in different thicknesses.