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Welcome to Arizona   The Healthy You: Health and Fitness Polls

Started Jun-6 by Jeri (azpaints); 12049 views.
Jeri (azpaints) said:

And our sun

I wonder if the UV from direct sunlight helps deactivate most of the viral particles, and thus reduce (but not totally eliminate) outdoor person to person spread.

Same with dessicating heat, which is more extreme in southern AZ than it is in west TX. I just spread out laundry on the truck tailgate that was wet out of the washing machine and it was bone dry within only about 15 minutes.

A huge wad of snot landing on a hot dry rock was completely dry in about 5 minutes, which would make a good stand-in for droplets.

The speed at which droplets totally become devoid of moisture and concentrate any dissolved salts to levels that destroy most pathogens is inversely proportional to the square of their diameter. The square vs cube rule means smaller droplets have a much smaller volume to surface area ratio than large droplets, combined with far less distance to the center for water to evaporate.

So they would still remain airborne as dust but effectively dried out. At least the understanding of viruses a doctor told me a couple of decades ago with some other dread disease outbreak, indicates they don't fare very well outside of some kind of moisture.

That might bear out why nearly all the cases in the Permian Basin were from indoor exposure at normal temperatures and humidities.

Of course the kind of dry heat we have causes nearly all complex organisms not specifically evolve for the conditions to not last too long unprotected. Some Darwin Award nominee tried to hike across the bottom of Death Valley and back in July one year. Evidently he ran out of water and quickly collapsed. They had to wait until about 2 AM to send out a recovery team, and I think it was delayed another 24 hours due to logistics or something. The corpse they recovered barely weighed maybe 45 to 50 pounds, when the living person who went out there started out at nearly 200 pounds.

So mummification was incredibly fast in that kind of heat.

kizmet1

From: kizmet1

Jun-6

Good time to plan a long drive far from the crowds.
Are you close to convention area and stadiums?
Jeri (azpaints)

From: Jeri (azpaints)

Jun-6

I doubt it.  We wouldn't be that lucky to have UV light kill it off.

Jeri (azpaints)

From: Jeri (azpaints)

Jun-6

Yes to three sports complexes.  Two of which are major arenas...Super Bowl  70,000 plus seating.

kizmet1

From: kizmet1

Jun-6

I hope you don't have a mob scene if you get the convention.

It might shorten the time they survive. But no one apparently has built up a virus half-live vs UV intensity vs UV wavelength 3D chart yet.

https://sites.nationalacademies.org/BasedOnScience/covid-19-does-ultraviolet-light-kill-the-coronavirus/index.htm

UV-C definitely kills it, but the air is pretty opaque to these wavelengths. It also burns the crap out of your skin. UV-C, from my experiences with such lamps, will produce quite a bit of ozone, which you can easily smell. It will burn you pretty badly even with rather short term exposure from an 18 watt mercury vapor type emitter, within a range of about 3 to 5 feet, but beyond about 25 feet seems to not burn as much.

I'm not sure exactly how far the 245 nm emission line really travels through air, as all the fluorescent material I had also reacts strongly to the 365 nm UV-A emission line as well, which penetrates a lot further in air. The 365 nm line is used in mineraological and "poster lamps" and probably doesn't have any significant virus killing possibility.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3292282/

http://gsp.humboldt.edu/OLM/Courses/GSP_216_Online/lesson2-1/atmosphere.html

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Atmospheric Absorption - Image Credit: NASAAtmospheric absorption percentages throughout the electromagnetic spectrum. Image Credit: NASA

Jeri (azpaints)

From: Jeri (azpaints)

Jun-7

I suspect we will.  But the city the stadium is in is prepared for large rowdy crowds, just not sure the are prepared for angry ARMED crowds since Arizona is a open carry state with a glitch in the law that allows teens to carry rifles and anyone to carry a semi auto.

 

 

Jeri (azpaints)

From: Jeri (azpaints)

Jun-7

We have a UV light system on our HVAC system we just installed in January.

kizmet1

From: kizmet1

Jun-7

Oh no! Sounds rough for the sane locals.
When I was young we had a Legionaires convention here. I remember feeling scared because of the anti war protesters doing their thing around the colisseum. The governor was pretty clever and had something like a "love in" as it was called in those days. He had it in a rural park on the far edge of the next county, on a river so they could all go skinny dipping instead of rioting.
Jeri (azpaints)

From: Jeri (azpaints)

Jun-7

Lol!  Innovative approach.  Naked means no weapons!

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