I’m stunned that the word “duct” doesn’t appear in this article. UV in ductwork is cheap, very effective, and has no downsides. I’m flummoxed why it isn’t widely employed. Can you help? Thanks.
My very naive baseline for questions like this is "large effects are easily measured", and the contrapositive "if it's hard to measure, the effect is small". Can you explain why this isn't the case for far-UV? Also, what are the reasons there doesn't seem to be much ground-up interest? Why aren't companies and homeowners installing it in such numbers that it becomes standard?
Crossposting this essay by my friend Gavriel Kleinwaks, who is approximately the world expert in Far UV deployment.
Disclaimer: In the interest of avoiding the problem where a post languishes in drafts forever, I am not attempting to be particularly rigorous, but I’m happy to answer questions to fill in details about how I’ve come to the conclusions I’m writing about. This post is informed by my work experience at 1Day Sooner, but only reflects my personal takes, not the official stance of my organization.
I work on indoor air quality to reduce disease burden and pandemic risk, and far-UV is an extremely promising intervention. One of the questions I get most often is, “If this is so promising, why isn’t it everywhere?” The answer requires a lot of breakdown and I get a lot of follow-up questions as soon as I start to answer, so this post is an attempt to run through the entire conversation at once. I’d never actually get around to posting this if I also included a deep dive on far-UV or tried to prove its value, so if you don’t know yet why it’s promising, you can check out this report.
Top line takeaway: Far-UV isn’t widely used because no individual organization has the incentive or bandwidth to install it, and the industry is stuck in a vicious cycle, making companies unreliable. Filtration is already widely used, but more user-friendly filters would greatly improve implementation.
Q: What are the major roadblocks to widespread use of high-quality filters?
A: The market is hard for consumers to navigate; it’s difficult for consumers to be well-informed enough to assess which filters are high-quality. For example, ionizers (ozone producing and, according to some researchers, basically ineffective1) and portable HEPA filters (no harmful byproducts, universally agreed to be useful) are both sold as “air purifiers.”
Q: What are the major roadblocks to widespread use of far-UV?
A:
Q: Okay, sounds like more real-world research is needed on far-UV. What are the major roadblocks to that research?
A:
Q: So far-UV is facing a vicious cycle. What differences in the state of the world would break the cycle—i.e. What’s your wish list?
A:
Q: If you need big research funders or a high-profile installation, why not try to start a government research program? This seems like exactly the sort of thing they do.
A: The American government is institutionally conservative/risk-averse and we have heard from government offices that they want to see more excitement from the private market before initiating their own investments9 in research. However, we really hope that governments get excited about far-UV eventually. One very reasonable outcome would be for us to find, through careful research and statistical analysis, that far-UV is almost never worth it for individual private-sector actors to use in peacetime, but that far-UV is invaluable during a pandemic. If that is the case, it would be important for the government to stockpile far-UV lamps and pay for their widespread installation, to only be turned on in the event of a pandemic.
Q: Are there any good standard-setters outside of the government?
A: America’s authoritative voice on indoor air quality is the American Society of Heating, Refrigeration, and Air-Conditioning Engineers (ASHRAE). They have no regulatory authority, but their standards are used and referenced by many other organizations, and some building codes require compliance with ASHRAE standards. As a professional association of HVAC engineers, the general body of ASHRAE doesn’t have much epidemiological expertise and isn’t traditionally focused on disease reduction. The COVID pandemic brought indoor air quality to the forefront of epidemiology, so ASHRAE has had more interest in disease reduction, but their standards still focus on HVAC interventions and do not provide guidance on the use of germicidal UV.
Q: If ionizers produce ozone and have mixed evidence for their efficacy, why aren’t they facing the same market issues as far-UV?
A: This question keep me up. Far-UV manufacturers will say that it’s because ionizer companies are better at sales, have bigger backers, and are more willing to use dishonest sales tactics, but that only kicks the question back to why far-UV companies are worse at sales and lack these same large backers as ionizer companies. I have no direct experience of ionizer companies’ sales tactics, but my experience with far-UV sales is that, in general, salespeople communicate very differently from researchers in ways that can read as dishonest, and that the field of far-UV is not uniquely virtuous about communication style when business is on the line. I believe that the success of ionizers has more to do with their purported use for eliminating other pollutants (not just pathogens) from the air, so consumers view them as an all-purpose air cleaner. Ionizers also started being marketed for home use in the mid-1900s, before the health concerns of ozone inhalation became widely known, so it’s possible that ionizers were just a well-timed product, and that now their use might slowly die off.
Q: Do you have a wish list for filtration?
A: Filtration doesn’t face the same hurdles as far-UV in terms of the vicious cycle relationship between research, market adoption, and government investment, and because it has benefits aside from pathogen reduction. We only spend so much time talking about far-UV because it takes longer to explain as a technology and because the adoption problem is so complicated. The problems with filtration are already being addressed by other parties, who have much greater comparative advantage in this area, so filtration doesn’t “need” 1Day Sooner. My wish list for filtration, which is already well underway, is:
I may add to/edit this list as more questions occur to me or as I learn more about the far-UV market. Thumbnail image from this biodefense meeting because I thought it was funny.
1
Personal communication with multiple researchers. I have not personally reviewed the literature—a quick glance shows research that seems to both prove and disprove the usefulness of ionizers, but generally I trust the researchers who I spoke with. As a history note, a coalition from the ionizer industry once sued a large group of air quality researchers over publishing research with negative outcomes.
2
Chamber studies can help address this type of uncertainty, but imperfectly—it’s hard to set up a chamber that imitates all the factors you’d want to consider, such as molecules’ diffusion or deposition. These factors might make far-UV look riskier than it really is, or they might mean that important considerations are missed.
3
Personal communication with a researcher who tried this avenue.
4
A study in nursing homes in Nova Scotia has been approved and is currently underway; the entire field is breathlessly awaiting results.
5
Yeah, this feels a bit like a distinction without a difference to me.
6
Corollary question that I get because of living in San Francisco amid the starry-eyed tech adventurers and entrepreneurs-by-temperament: If I think that having a reliable far-UV lamp is necessary, why don’t I go found a startup about it?
On the personal fit side, I’m just not that driven to found a startup. It’s not my comparative advantage and I don’t think I’d enjoy it that much—but who knows. As for the field itself, far-UV hasn’t made anyone any money yet; hence the existing companies being constantly on the brink of going out of business. Anyone getting into this field would have to just commit to eating a very large loss that I am not willing to contend with. This type of coordination problem definitionally can’t be solved by the market. (I definitely hope that this line of business becomes profitable; just describing the current state of affairs.) Plus, engineering in the physical world has very high overhead—if I wanted to work on the mechanics of far-UV, I’d just go work for the nonprofit working on that and increase their bandwidth and help them work faster, rather than start from scratch to figure out manufacturing best practices and whatnot. (Of course, this very much relies on my belief that the nonprofit in question is good at what they do—people in other industries may very well see many more opportunities to fix things that other people in the field are doing wrong.)
That all being said, I very much believe that the entire far-UV field shouldn’t rest on the shoulders of one or two manufacturers, so if you are a mechanical engineer digging around for new challenges and you’re not put off by everyone else’s failure to turn a profit, I’d be enthusiastic about your building a lamp and would do my best to help you get in touch with people you could learn from.
7
Personal communication with the group.
8
Personal communication with an industry sales rep. We were discussing a large but low-control study that some researchers were preparing, and he was pretty scared that it would show no effect. I was surprised to hear that he considered scientific literature so paramount to his business, because I figured that potential buyers never read the scientific literature anyway, but he told me that the decision-makers, like facilities managers, work with engineers who do read the literature, and that investors and research grantors do too, and null results make them disinclined to invest or fund higher-control research.
Why run low-control studies anyway? They can be much less expensive (depends on the setting) and they’re more reflective of real use!
9
Ironically, government research and a government standard would probably make everyone else in the private sector feel a lot better about far-UV! While navigating this field, it has felt like each group is waiting for the other to move first.
10
Corollary: it might be that one good use of philanthropic money would be to heavily subsidize and distribute ClearAirKits filters, or take out a massive ad campaign for them. My guess is that such a project wouldn’t meet an EA funder bar, but would be good for some major public health funder that likes local/immediate community work, like Chan Zuckerberg. I have not researched this carefully.