AlumniLawn wrote:Redmires wrote:Lootman wrote:
But now you are talking about all safety risks from air travel rather than just Covid, which was the question here. And in general air travel is considered the safest form of public transportation. To be fair you should compare the safety risks of air travel with those involved in travel by bicycle, car, bus, train, ship etc., not that those provide a real alternative to air travel in most cases anyway.
I know it's slightly off-topic but I was really questioning the statement that cabin air is cleaner than hospital operating theatres. Are the filters really that efficient when they don't seem to filter out the fume event chemicals (including organophospates) ?
https://www.bbc.co.uk/news/stories-51633897
Aircraft have H13 HEPA filter (99.9% efficient) and operating theatre's generally have H14 HEPA filters (99.99% efficient). The critical difference is that an OT is a sterile(ish) area generating very, very little free particulate whilst an aircraft is full of particulate matter from fabric, skin, hair amd so on plus the residue of coughs and sneezes which are all in circulation until removed by the filtration system. The quality of air in an OT is infinately cleaner than that in an aircraft not due to the filters but due to the absence of generating detritus.
Bang on!
The relative cleanliness between the air at the input and output ports on an AC filter is a very good indicator of how well that filter works and not a whole lot else
- if it were otherwise you could stick someone in a high-end face mask on a treadmill in the corner of the room to do the job for everyone else
There are ways to measure how effective things might be in practice, but you'll not generally find them on a product datasheet
-sd