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Dr. Richard Corsi Profile picture
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20 Mar, 4 tweets, 1 min read
1/ As states struggle w/ funding higher education they should not look at this as allocation, but rather investment in both the short & long-term future. Investment in STEM education has a rapid and significant return on investment when students stay in-state after graduation.
2/ I've done a detailed analysis based on graduates of the Maseeh College of Engineering and Computer Science @Portland_State. Every $1 spent on a student yields a return on investment of 12%/yr ($320% over 10 yrs) in Oregon State income tax alone.
3/ This analysis is based on fraction of graduates employed in Oregon, starting salaries w/ annual increases, and use of the State's income tax calculator. The ROI would be much higher if property tax, start-up businesses, etc., are included.
4/ Most people, and certainly states, would be happy with 12%/yr yield and 320% ROI over 10 years.

Invest in the future. Just Do It!

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More from @CorsIAQ

Dr. Richard Corsi Profile picture
20 Mar
1/ Distancing and Shared Air.

Full disclosure. I want children back in school for their mental, social, & physical health, & for their future.

But I continue to be deeply concerned by a lack of attention & messaging on what needs to be done to EFFECTIVELY make schools safer.
2/ IMO, 3 ft of physical distancing is probably fine with UNIVERSAL MASK WEARING in classrooms in terms of inhalation dose by close contact.
3/ I have some concern about such distancing when masks are NOT worn, e.g., while eating, particularly given a much more infectious virus now than "coronavirus classic". I provided some guidance on lunch periods in my EPA school webinar months ago - at corsiaq.com
Read 13 tweets
Dr. Richard Corsi Profile picture
17 Mar
1/ I have spoken with dozens and dozens of school districts. My recommendations include universal masks, increased ventilation, and stick with PROVEN technologies.
2/ Improved filtration as per MERV rating (to MERV-13 if possible), portable HEPA filtration (appropriately-sized), and upper-room or in-mechanical-system UVGI (in-system if significant recirculation rates high). Add good DYI box-and-fan systems if sealed properly. Just Do It!
3/ When a district official says "Yes, but I hear that this ..." or "What about this ....". I just repeat - stick with PROVEN technologies (see above). "But we were told ..." stick with PROVEN technologies. "But ...." Stick with PROVEN technologies.
Read 7 tweets
Dr. Richard Corsi Profile picture
14 Mar
1/ Concerns about under-ventilation of indoor spaces are FAR from new. Here are just 3 of many examples.
2/ Ben Franklin (18th century): "I am persuaded that no common Air from without, is so unwholesome as the Air within a close Room, that has been often breath'd and not changed" Franklin advocated exposure to fresh air & including open windows when sleeping.
3/ Florence Nightingale (mid 19th century): “Keep the air the patient breathes as pure as the external air, without chilling him.”
Read 6 tweets
Dr. Richard Corsi Profile picture
12 Mar
1/ Proven Technology. The cost to put a very good portable HEPA filtration system in a classroom that typically holds 24 or 25 students is approx $10/student/yr (year 1), with recurring filter & energy costs of around $7/student/yr. Per year. Not per day, week, or month.
2/ The system can often yield an equivalent of 3 or more ACH &, at ventilation rates I have seen in a majority of schools in Texas, 60-75% overall reduction in inhaled dose of virus-laden paricles in shared air.
3/ In the US we spend approximately $15,000/year to educate a SINGLE student. To effectively reduce virus-laden particles in classroom air would add a whopping $7-10/student each year to this total. Two Grande Frappaccunios, folks. Proven technology.
Read 4 tweets
Dr. Richard Corsi Profile picture
11 Mar
1/ Proven and unproven technologies. We have proven technologies for removing virus-laden aerosol particles from air: Increased ventilation, portable HEPA filtration systems (properly sized for space), and advanced MERV-rated filters (12 or 13) if mechanical system can handle.
2/ We have a proven technology that will inactivate viruses in aerosol particles - upper-room UVGI.
3/ These technologies have been proven for many decades, studied by many independent researchers for their effectiveness and published in peer-reviewed journals (which means even more analysis by independent researchers).
Read 9 tweets
Dr. Richard Corsi Profile picture
8 Mar
1/ Recently spoke with an official for a private multi-school organization that has large garage-door-like openings on every classroom. I was asked about ventilation with what amounts to nearly an entire wall open to the outdoors.
2/ This is similar to research that @JohnnyGrinch & I did a few years ago on ozone decay rates in residential garages in Austin. This work required simultaneous analysis of air changes per hour in garages (abstract only here)
sciencedirect.com/science/articl…
3/ In 12 garages @JohnnyGrinch measured a mean of approximately 0.5 ACH in garages w/ doors closed (range from close to 0 to 0.8/hr. A limited amount of experiments were done with the door completely open.
Read 10 tweets

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