HEPA has been hijacked by marketers, technically High Efficiency Particulate Arrestor (HEPA) is not a recognised standard, air filters are classified in accordance with the size of particles arrested and efficiency of arrestance at given pressure drop.They do massively exceed the HEPA standard though.
Which air purifiers work then to trap covid ?
There are so many on the market with lots of gimmicks and new technology I am confused.
I know about the israeli one called "Aura " which is being used on buses, lifts etc.
https://www.israel21c.org/israeli-ai...k-irish-buses/
I wonder do the hotels do extra, get extra hepa filters, etc. to improve the ventilation of all the air that goes to the rooms? I guess go for hotels that have windows that open if there are any.
FFS its been fucking 2 years and we are still arguing over masks efficacy.
Masks do help to certain extent. Its not great. You can still smell a fart. Masks can help slow the spread but covid is so widespread now, it is like trying to put out a forest fire with a wet cloth.
The argument now should be: "should we just move on, get vaccinated and live with Covid".
It is hard to believe people are still discounting masks. People confuse viral size with particle size. The virus does not float around as a isolated virus, it is carried in aerosol droplets of various sizes. The droplets are much larger than the virus particle, by a factor of 10 or more.
The viral loaded droplets are caught in the masks to an extent that reduces transmission.
No one is saying they are perfect- and they are very inconvenient and a total bore. They really are not needed right now in Hong Kong. Masks are crap but masks also help. Maskless heroes in the current environment are really just not conforming to the social context of HK right now and are demonstrating a lack of empathy with the HK populace.
You doubters must wonder why surgeons bother to wear surgical masks... *cough*
https://www.nature.com/articles/s41591-020-0843-2
Just a thought. It would be interesting to if someone had an air quality monitor that monitors everyday the quality of the air in their hotel room over a period of 21 days.
Correction, this maskless hero is demonstrating an utter contempt for the unvaccinated hypocrites and general idiots in HK.
I had another scenario on the tram this morning, some unvaccinated tosser shouting about masks and about how much he loves HK and therefore why I'm obviously wrong to dare to not wear a mask in his presence.
I'll repeat he is unvaxxed.
The tosser keeps shouting, shouts at the driver, the driver stops the tram and shouts at me, the younger people sitting next to me get impatient and explain 'the rules', I explain how the rules are selectively enforced and that really it is people like the old tosser who are causing the problem, holding the more upwardly mobile part of society hostage.
A light goes on behind their eyes, they agree and turn on the driver telling her to be quiet and get back to driving.
Everyone carries on and the only one unhappy is the tosser; just the way it should be.