If the U.S. Environmental Protection Agency has deemed a particular air pollutant to be so dangerous that any exposure to that pollutant could cause death within hours, why did the EPA conduct tests on more than 40 people in North Carolina involving exposure to high levels of that pollutant?

Steve Milloy, founder and publisher of JunkScience.com, wants to know. He’s filed a complaint with the N.C. Medical Board in connection with the tests involving the EPA and UNC-Chapel Hill. Milloy discussed his complaint during a presentation today to the John Locke Foundation’s Shaftesbury Society.

In the video clip below, Milloy explains who might bear some blame for exposing human test subjects to the pollutant, known as airborne fine particular matter or PM2.5.

2:15 p.m. update: Click play below to watch the full 47:56 event.

You’ll find other John Locke Foundation video presentations here.