Question: What are the different types of masks you can use to prevent transmission of COVID-19?

Answer passage (source: WHO):
page_title: Q&A: Masks and COVID-19
section_headers: What types of masks are used against the spread of COVID-19?
section_content: Medical masks (also known as surgical masks): these are made from a
minimum of three layers of synthetic nonwoven materials, and configured to
have filtration layers sandwiched in the middle. These masks are available in
different thicknesses, have various levels of fluid-resistance and two levels
of filtration. These medical masks reduce the transfer of saliva or
respiratory droplets from the wearer to others and to the environment. They
also decrease the likelihood of potentially infectious droplets from others
reaching the mouth and nose of the mask wearer.
Hand hygiene should be performed before putting on a clean mask and after
removing the mask. These masks should be worn tightly around the chin and top
of the nose. The wearer should avoid touching the mask while it is on the face
and the mask should be immediately discarded if it becomes moist. Importantly,
wearing a mask must be combined with other preventive measures including
performing frequent and appropriate hand hygiene and physical distancing of at
least 1 metre (3 feet).
Respirators (also known as filtering facepiece respirators --FFR) and
available at different performance levels such as FFP2, FFP3, N95, N99):
these are specifically designed for healthcare workers who provide care to
COVID-19 patients in settings and areas where special medical procedures are
undertaken. Respirators are intended to protect the wearer when these medical
procedures aerosolize smaller particles than normal droplets into the air in
the health treatment area. Healthcare workers should be fit tested before
using a respirator to ensure that the respirator is sealed tightly on the
wearer’s face and is properly fitted. Respirators with valves should not be
used as the purpose of source control.

Reviewer feedback on this answer:
I think that this is a decent answer.  There is information on multiple types of masks included in the answer.
While these are masks that would help prevent transmission they should not be recommended to a lay person due to the shortage of supplies that are affecting healthcare providers as is. This section should be a last resort and requester should be referred to cloth masks or other types of masks they can use such as one-use/disposable ones.

Reviewer ratings:
Excellent
Could be Improved

Answer passage (source: WHO):
page_title: Q&A: Masks and COVID-19
section_headers: What are non-medical masks and what is their use?
section_content: Non-medical masks are often homemade of breathable fabrics and can be
commercially available as well. There are numerous designs for fabric masks,
but they generally cover the nose and mouth, are secured with ties or elastic
loops, include multiple layers of fabric, and can sometimes be washed and re-
used.
The evidence about the benefits of these masks is limited. One good quality
study showed that the risk of respiratory infection is increased (and not
reduced) in health care workers using cotton cloth masks when compared to
medical masks. Cloth masks are currently being recommended by some countries
as a means of source control in the general population. Although their
protective effectiveness to the wearer is unknown, they may protect others if
the wearer is a pre-symptomatic or asymptomatic carrier.
WHO is continuing to gather and review data as new studies become available
and will update guidance accordingly.

Reviewer feedback on this answer:
Answer is restricted only to non-medical masks, particularly cloth masks, but if the requester is a lay person then this could be a good primer for information. Answer could provide more links as to what kind of materials are good besides just mentioning cotton masks.
I think that the answer could include information on different types of masks.  There is good information on one type of mask though.

Reviewer ratings:
Acceptable
Acceptable

Answer passage (source: WHO):
page_title: Q&A on coronaviruses (COVID-19)
section_headers: How does COVID-19 spread?
section_content: People can catch COVID-19 from others who have the virus. The disease spreads
primarily from person to person through small droplets from the nose or mouth,
which are expelled when a person with COVID-19 coughs, sneezes, or speaks.
These droplets are relatively heavy, do not travel far and quickly sink to the
ground. People can catch COVID-19 if they breathe in these droplets from a
person infected with the virus. This is why it is important to stay at least 1
meter) away from others. These droplets can land on objects and surfaces
around the person such as tables, doorknobs and handrails. People can become
infected ~~~~ by touching these objects or surfaces, then touching their eyes,
nose or mouth. This is why it is important to wash your hands regularly with
soap and water or clean with alcohol-based hand rub.  
WHO is assessing ongoing research on the ways that COVID-19 is spread and will
continue to share updated findings.

Reviewer feedback on this answer:
No mention of masks of any kind are made and only information given is on how COVID-19 itself is spread.
The information here is relevant.  A person looking up information about masks would be interested in the information here, but it doesn't really answer the question.

Reviewer ratings:
Bad
Could be Improved