Steve Milloy, founder and publisher of JunkScience.com, explains who might bear some blame in connection with U.S. Environmental Protection Agency tests involving people exposed to elevated levels of the air pollutant known as airborne fine particulate matter, or PM2.5. Milloy offered these comments during a July 16, 2012, speech to the John Locke Foundation’s Shaftesbury Society. To watch full-length presentations of JLF events, click here.