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Don't forget to vent this Thanksgiving by operating your range hood. One of the most under-utilized tool in our homes! It took me three trials to find a range hood with high exhaust airflow. I also retroffited my hood to vent to the outside (and not recirculate air). 1/4

For those who follow residential IAQ standards, there have been a couple of positive recent developments in ASHRAE Std 62.2 1) UL 2998 ozone compliance requirement for air cleaners (as in 62.1) 2) Minimum filter efficiency increased to MERV 11 from MERV 6 (now better than 62.1)

Using AHAM CADR recommendations this translates into an effective room size of 51 square feet (a closet). In the understatement of the year, the report concludes that this is “small compared to many of the intended use cases for these devices.” (Schools are a good example.)

Short summary: This USB-powered mini-Corsi-Rosenthal box of mine is way better in filtering air than ionizers masquerading as air purifiers.

To put this into perspective, a single $400 portable HEPA air filter, or Corsi-Rosenthal DIY air filter box we have bought and built for less than $100, produce ten times MORE clean air than this bipolar ionization technology. But this tech is what a lot of schools invested in.

Mr. Eldredge 🇺🇸 NALTIC Industrials, LLC Liesl McConchie Prasad Kasibhatla Discount Derek Hough (now exclusively on Disney+) Jeff Smith on Air Pollution (BreatheLife2030.org) 🤜❤️‍🔥🤛Challenger 🩺mission impossible❔️ Nancy Delagrave Wade Conlan A Stacyi 🇺🇸 Logan Mitchell PhD 🇺🇸 The Church of Jesus Christ of Latter-day Saints Don Milton @donmilton.bsky.social Bill Bahnfleth Marwa Zaatari David Elfstrom Rick Bright Linsey Marr https://www.threads.net/@linseycmarr María Gallego Blanco Mary Richards Church News @[email protected] Spencer Cox Sharon Erin Alberty Lisa Riley Roche kgjames 𝙹𝚘𝚎 𝚅𝚒𝚙𝚘𝚗𝚍 [email protected] Prof. Jose-Luis Jimenez zeynep tufekci Trisha Greenhalgh Jonathan's translucent form David Fisman Orla Hegarty Marcel Loomans Pawel wargocki Kimberly Prather, Ph.D. John Johnston P. Jacob Bueno de Mesquita UMD Public Health CIDRAP Jim Rosenthal Trent Toone President Donald J. Trump Andrew Pavia KSL 5 TV Mike Anderson Marc Harrison MD h/t: Maarten De Cock

1/ New study by EPA researchers and Jacobs Tech Inc. Large-scale evaluation of microorganism inactivation by bipolar ionization and photocatalytic devices Important findings ..... sciencedirect.com/science/articl…

Thank goodness for this timely study conducted by the EPA on bipolar ionization. It shows that this product is not effective in a chamber representing a "large scale environment." The chamber is 3,000 ft.3 - about half the size of the average classroom. sciencedirect.com/science/articl…

The bottom line is pretty straightforward. It is very doubtful that this technology is working as advertised in any of the thousands of school buildings where it has been installed. As Prof. Jose-Luis Jimenez said two years ago - "you can't clean the air with chemistry."

My interview with Yvan Pandelé of Heidi News about World Health Organization (WHO) failure to acknowledge #COVIDIsAirborne came out at the same time...here is translated version. heidi.news/articles/covid… science.org/content/articl…

I have created a step-by-step guide to building a #CorsiRosenthalBox. Thank you Jim Rosenthal & Richard Corsi, PhD, PE (Texas) for approving it. Displaying it in waiting rooms, offices, schools, and libraries will help more people stay safe this season. Please DM me if you need a PDF or another size.

Reminder #corsirosenthalbox is cost effective!!

Germicidal UV lamps can disinfect circulating air, but their wavelengths could also produce air pollutants. Zhe Peng, Shelly Miller, PhD and Prof. Jose-Luis Jimenez at modeled the reactions initiated by by UVC sanitizing light. More about this research: fal.cn/3uj6j CIRES

Should you upgrade to a P100? I do my best to make the case that it's best to focus on fit first, before moving to higher filtration. Also there are penalties to be had to going to higher filtration. N95's & KF94/KN95/FFP2 are the sweet spot IMO. youtu.be/QH1xiOZFGxo

The call for members for ASHRAE Standard 241 is now open at the ASHRAE web site. Committee members need not be ASHRAE members - but they need to have qualifications we need and to be willing to work very hard for about the next six months.

No way around: we must clean indoor air. The costs to our workforce and death toll will continue to skyrocket until we do. Do NOT be short sighted & say it's too expensive! We made changes to filter water. Now we must do air. Make 2023 the year the world woke up! #cleanindoorair

I will participate in this Webinar tomorrow, highlighting some of the conclusions from recent #COVIDConsensus study led by Jeffrey V. Lazarus et al. in nature: nature.com/articles/s4158… [I will talk about masks, and how mask quality & fit REALLY REALLY matter - & get little attention]

Thanks for this outstanding and important study, Robin Dodson! 👇

ASHRAE approves groundbreaking Standard to safeguard indoor spaces from disease transmission. The new ASHRAE Standard 241- Control of Infectious Aerosols is a major step forward in reducing the risk of infectious disease spread in buildings. bit.ly/3pkMDAg. #MyASHRAE

Most of us spend about 90% of our time indoors And if you care about improving indoor air quality to reduce burden of flu, RSV, COVID and other respiratory diseases This is a big deal ASHRAE approves new, groundbreaking standards Huge thanks to ASHRAE's leadership here