Discover and read the best of Twitter Threads about #ionization

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Frequently questions about type of room air filtration & if #ionization is a useful upgrade.

Nearly always, simple filtration is sufficient for most people. Study here shows a bipolar ionizer also *not* useful at reducing PM2.5. Thx @JimRosenthal4. (1/x)…
2/ "[experiments] ... suggest that operation of the ionizer unit led to a small increase in loss rates for ultrafine particles (<0.15 μm) and a small decrease in loss rates for larger particles (>0.3 μm), but with negligible net changes in estimated PM2.5 loss rates."
3/ In contrast to relative ineffectiveness of ionization technology to reduce concentration of suspended particles in a room, simple #HEPA filtration does an *excellent* job. See e.g. examples in this 🧵 showing filtration in a school classroom.
Read 7 tweets
Experts say NO to #ionization & #oxidant “purification” systems.…
“As officials search for solutions to protect classrooms from the novel coronavirus. Unfortunately, in this case, school administrators may have fallen for snake oil, and taxpayers are footing the bill.”
“Most tested the ionization devices on small rooms or tiny chambers without sufficient controls. Moreover, none of the research is peer-reviewed.”
Read 4 tweets

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