Hear This Idea #72 – Richard Bruns on Indoor Air Quality
56 snips
Nov 4, 2023 Richard Bruns, Senior Scholar at Johns Hopkins Center for Health Security and former Senior Economist at the US FDA, discusses the importance of indoor air quality (IAQ) and interventions to improve it such as air filtration and germicidal UV light. They also explore the impact of particulate matter on human health, the value of statistical life, national policy changes needed for widespread adoption of IAQ interventions, and the role of FDA regulation. Additionally, they touch on rethinking cost-benefit analysis, complex systems, and cultural socialization.
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Prioritise Airflow Not Brand Quietness
- Use high Clean Air Delivery Rate (CADR) portable air cleaners or DIY Corsi‑Rosenfeld boxes rather than quiet low‑flow commercial units.
- Prioritise moving a lot of air through MERV‑13+ filters; box fans plus filters often outperform expensive quiet purifiers.
Doubling Air Changes Cuts Infection Risk
- Doubling air changes per hour roughly halves airborne infection risk (exponential decay).
- Investing up to ~10–15 ACH remains economical; practical limits often set by acceptable noise.
UV Can Sterilize But Also Create Indoor Smog
- Germicidal UV targets pathogens but can generate harmful indoor secondary chemistry (smog) when it hits materials.
- Upper‑room UV and in‑duct UV are established; far‑UVC (222 nm) is promising but currently limited by cost and unknown interactions.