I will be sharing this important post far and wide - thank you.
FLOATING DROPLETS
The terminology used in research is confusing and problematic for all - does the term “floating droplets” include aerosols, droplets and particles in your opinion? We urgently need to clarify those terms to avoid confusion by all.
I will be sharing this important post far and wide - thank you.
FLOATING DROPLETS
The terminology used in research is confusing and problematic for all - does the term “floating droplets” include aerosols, droplets and particles in your opinion? We urgently need to clarify those terms to avoid confusion by all.
Based on the dozens of sometimes conflicting papers I’ve reviewed over the last 24 months, I have been using droplet size up to 100 microns as “floating droplets” which can persist up to 16 hours after reviewing dozens of conflicting papers. Above 100 microns fall to the floor within about 6-10 feet - not only sub 20 microns. This seems like a critical factor with quite a bit of variance from authoritative sources.
My understanding is that masks and filtration must handle floating droplets from 0.1 microns up to 100 microns.
I will find those papers and post today.
0.3 microns and below are the “most penetrative particle size” (MPPS) meaning it penetrates deep into the lungs, which is why N95s with electrostatic filters are so effective. MPPS particles of 0.3 microns is the standard size used for N95 certification and is the most difficult to filter.
AIR QUALITY METERS
I believe all public places must have an accurate, publicly available meter showing Air Changes Per Hour (ACH) and perhaps some other way to measure “dead air” building up, like CO2 monitors or an introduced substance/gas that can be measured to warn of poor ventilation.
It should be instantly clear if ventilation is not working, so we know a restaurant is actually safe for instance.
If we can radically improve ventilation and N95 mask use we could withstand a new killer virus/variant without shutting down the economy. Crucial.
I will be sharing this important post far and wide - thank you.
FLOATING DROPLETS
The terminology used in research is confusing and problematic for all - does the term “floating droplets” include aerosols, droplets and particles in your opinion? We urgently need to clarify those terms to avoid confusion by all.
Based on the dozens of sometimes conflicting papers I’ve reviewed over the last 24 months, I have been using droplet size up to 100 microns as “floating droplets” which can persist up to 16 hours after reviewing dozens of conflicting papers. Above 100 microns fall to the floor within about 6-10 feet - not only sub 20 microns. This seems like a critical factor with quite a bit of variance from authoritative sources.
My understanding is that masks and filtration must handle floating droplets from 0.1 microns up to 100 microns.
I will find those papers and post today.
0.3 microns and below are the “most penetrative particle size” (MPPS) meaning it penetrates deep into the lungs, which is why N95s with electrostatic filters are so effective. MPPS particles of 0.3 microns is the standard size used for N95 certification and is the most difficult to filter.
AIR QUALITY METERS
I believe all public places must have an accurate, publicly available meter showing Air Changes Per Hour (ACH) and perhaps some other way to measure “dead air” building up, like CO2 monitors or an introduced substance/gas that can be measured to warn of poor ventilation.
It should be instantly clear if ventilation is not working, so we know a restaurant is actually safe for instance.
If we can radically improve ventilation and N95 mask use we could withstand a new killer virus/variant without shutting down the economy. Crucial.