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During the pandemic, weve been encouraged to adhere to physical distancing in restaurants and office spaces to limit the spread of the virus.

The rule of thumb is at least two metres between each person, desk, or chair.

Weve also been told that the risk increases in indoor spaces.

As the months have rolled on, scientists have been able to collect more data, leading to more accurate risk assessments.

Per Fast Company, John Bush, a professor of applied mathematics at MIT, says that the rules that weve been sticking too arent as effective as we thought they were.

Bush, alongside his MIT colleague Martin Z. Bazant, has created acomplex mathematical model, which simulates the fluid dynamics of virus-loaded respiratory droplets in any space, from a small kitchen to a massive concert hall.

To make things simpler for those of us who die a little inside when confronted with mathematics in general, let alone the complicated kind, they converted their findings into an online tool that anyone can use to judge COVID-19 risk scenarios.

If you visit the website, youll fill out some basic information about your space.

The tool assumes one person in a room with you has COVID-19. Variables that youll fill in include:

Whats the square footage? Whats the height of the ceiling? How about the HVAC systemis it a standard domestic furnace or does it have a fancy HEPA filter? Whats the humidity? Is a window open?

The variables also include all sorts of details about human behavior: How many other people are there with you? Are they wearing masks? Cotton or surgical? Do they wear masks properly or pull them down their face a bit? Are they whispering or singing?

I took a random listing for a 467m commercial property from a real estate website, with a 70m open-plan office space which seats 35 people.

Well be using the open-plan office space with a standard air conditioning system to work things out. The room would be filled to capacity with employees who take their masks off and talk while working.

In other words, a standard office situation.

Room Specifications

Total floor area: 70m

Ceiling height: 12 metres

Ventilation: Mechanical ventilation (air conditioning)

Filtration system: residential/commercial/industrial

Recirculation rate: moderate

Relative humidity: 60% (average)

Human behaviour

Exertion level: resting (at a desk)

Respiratory level: talking (normal)

Mask type: none (while in office) / surgical cotton.

Mask fit: none

Result:

Based on this model, it should be safe for this room to have:

The two-metre distancing guideline would indicate that up to one person would be safe in this room for an indefinite period.

To summarise, if this room has 35 people, its occupants would be safe for four minutes.

Those results are pretty terrifying.

You can then tweak the system to see if the results change, by, for example, changing no masks to cotton masks at all times, or increasing the distance between employees.

Opening the windows to increase airflow also makes a difference:

Room Specifications

Total floor area: 70m

Ceiling height: 12 metres

Ventilation: Open windows

Filtration system: Open windows with fans

Recirculation rate: moderate

Relative humidity: 60% (average)

Human behaviour

Exertion level: resting (at a desk)

Respiratory level: talking (normal)

Mask type: surgical cotton worn at all times

Mask fit: 95%

Result:

Based on this model, it should be safe* for this room to have:

The two-metre distancing guideline would indicate that up to one person would be safe in this room for an indefinite period.

If this room has 35 people, its occupants should be safe for 15 minutes.

The risk decreases with additional safety measures.

Obviously, this is just a model, but it is useful for determining the safest possible environment for the people entering a space.

It also doesnt take into account sanitising measures and regular screening.

Its a highly contagious virus, and its difficult to beat, but PPE and some regular handwashing, alongside quarantining if you feel that youve come into contact with an infected person, can go a long way towards keeping yourself and others safe.

You can tinker with that MIT tool here.

[source:fastcompany]

Read more:
Here's What Happens When One Person In A Room Has COVID-19 - 2oceansvibe News