Question: Why is the world healthcare organization recommend in contact and droplet precautions and not use of airborne precautions for healthcare workers

Answer passage (source: WHO):
page_title: Q&A: Infection prevention and control for health care workers caring for patients with suspected or confirmed COVID-19
section_headers: Are boots, impermeable aprons, or coverall suits required as routine personal protective equipment (PE) for healthcare workers (HCW) caring for patients with suspected or confirmed 2019-nCoV infection?
section_content: No. Current WHO guidance for HCW caring for suspected or confirmed 2019-nCoV
acute respiratory disease patients recommends the use of contact and droplet
precautions, in addition to standard precautions which should always be used
by all HCW for all patients. In terms of PPE, contact and droplet precautions
include wearing disposable gloves to protect hands, and clean, non-sterile,
long-sleeve gown to protect clothes from contamination, medical masks to
protect nose and mouth, and eye protection (e.g., goggles, face shield),
before entering the room where suspected or confirmed 2019-nCoV acute
respiratory disease patients are admitted. Respirators (e.g. N95) are only
required for aerosol generating procedures.
Click here for more information on PPE for HCW caring for suspected or
confirmed nCoV patients.

Reviewer feedback on this answer:
Detailed answer is given regarding "contact and droplet precautions" for healthcare workers dealing with COVID-19 patients including a link for additional information for the healthcare workers to follow.
It gives a basic reason for not using aerosol protection according to WHO, but the detailed information is in the final link.

Reviewer ratings:
Acceptable
Acceptable

Answer passage (source: WHO):
page_title: Q&A: Considerations for the cleaning and disinfection of environmental surfaces in the context of COVID-19 in non-health care settings
section_headers: Are public systems for disinfecting individuals such as spraying via tunnel or chambers safe to use?
section_content: No. Spraying of individuals with disinfectants (such as in a tunnel, cabinet,
or chamber) is not recommended under any circumstances. This practice could be
physically and psychologically harmful and would not reduce an infected
person’s ability to spread the virus through droplets or contact. Even if
someone who is infected with COVID-19 goes through a disinfection tunnel or
chamber, as soon as they start speaking, coughing or sneezing they can still
spread the virus.
The toxic effect of spraying with chemicals such as chlorine on individuals
can lead to eye and skin irritation, bronchospasm due to inhalation, and
potentially gastrointestinal effects such as nausea and vomiting. In addition
to health safety concerns, the use of chlorine in large-scale spraying
practices may prevent this resource from being used for important
interventions such as drinking water treatment and environmental disinfection
of health care facilities.

Reviewer feedback on this answer:
Answer is referencing spraying individuals with chemical disinfectants and barely mentions droplet precautions for healthcare workers.
discusses disinfection methods that are aerosol, but does not narrow it down to why the WHO is recommending to not use it.

Reviewer ratings:
Bad
Could be Improved

Answer passage (source: WHO):
page_title: Q&A: Infection prevention and control for health care workers caring for patients with suspected or confirmed COVID-19
section_headers: Why does WHO recommend contact and droplet precautions and not routine use of airborne precautions for healthcare workers providing care to patients with suspected/confirmed 2019-nCoV infection?
section_content: WHO developed its rapid guidance based on the consensus of international
experts who considered the currently available evidence on the modes of
transmission of 2019-nCoV. This evidence demonstrates viral transmission by
droplets and contact with contaminated surfaces of equipment; it does not
support routine airborne transmission. Airborne transmission may happen, as
has been shown with other viral respiratory diseases, during aerosol-
generating procedures (e.g., tracheal intubation, bronchoscopy), thus WHO
recommends airborne precautions for these procedures.
Click here for more information about healthcare worker protection for
2019-nCoV.

Reviewer feedback on this answer:
The "why" is addressed in this question as being due to the "modes of transmission" of COVID-19 so that the healthcare workers can understand the need for the airborne precautions.
This gives the exact reason why WHO is giving the precautions they are using.

Reviewer ratings:
Excellent
Excellent