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Jose-Luis Jimenez and Kimberly Prather on the intersection of aerosol science and the COVID-19 pandemic

January 18, 2022·25 min·2 clips

Kim Prather studies aerosols traveling 10,000 miles, yet officials claimed COVID stops at six feet.

This episode features atmospheric chemists Kimberly Prather of UC San Diego and Jose-Luis Jimenez of the University of Colorado, Boulder, reflecting on their pandemic roles. Both scientists became prominent public voices arguing that COVID-19 is primarily transmitted through airborne aerosols. They discuss their efforts to correct public health messaging that initially emphasized surface transmission and large droplets. The hosts trace the historical dogma in medicine that minimized airborne spread back to public health researcher Charles Chapin in 1910. Prather notes her shock at the six-foot rule, citing her research showing aerosols can travel thousands of miles. The World Health Organization's March 2020 tweet stating "COVID-19 is not airborne" catalyzed scientists, including Jimenez, to challenge the agency. A major review Prather co-led in August 2021 compiled evidence from air sampling, epidemiology, and modeling for airborne spread. Jimenez estimates that acknowledging airborne transmission earlier could have saved hundreds of thousands of lives. Prather found the idea that aerosols stop at six feet "kind of a joke" given her work tracking particles across oceans. Both scientists describe being dismissed by public health officials who they say lacked evidence for their droplet theory. Their use of Twitter exploded, with Jimenez growing from 300 to over 85,000 followers, enabling direct public communication and new scientific collaborations. Jimenez describes a strategic media partnership with CBS medical correspondent Dr. Jon LaPook to amplify the airborne message. Emotional moments included a hospital worker in Ecuador crying upon learning about airborne transmission after experiencing household spread. Jimenez recounts spending hours emailing safety instructions to a woman whose husband with cancer needed family visits before vaccines. Prather states the work is exhausting but rewarding because "people's lives depend on it." Jimenez emphasizes they persisted not for scientific debate but because "lives are on the line." The tone is a reflective and conversational interview, blending personal narrative with scientific explanation. It carries a undercurrent of frustration over institutional inertia but also highlights professional camaraderie. Listeners interested in science communication, public health policy, or the intersection of research and societal crisis will find this compelling. Those seeking only the latest COVID-19 guidance or who are weary of pandemic retrospectives might skip it.

As heard by us

Two atmospheric chemists turn a COVID transmission debate into a tight, revealing look at evidence, advocacy, and frustration.

Kimberly Prather and Jose-Luis Jimenez spend this episode on the fault line where aerosol science ran into public confusion. Two atmospheric chemists who had long studied particles in the air, they ended up among the clearest voices arguing that COVID spread through the air, not…

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Hear two atmospheric chemists explain why airborne spread became a public fight.

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