House Science, Space, and Technology Subcommittee on Investigation and Oversight Chair Paul Brown (R-GA) requested October 18 that Environmental Protection Agency Inspector General Arthur Elkins investigate agency studies that exposed people to fine particulate matter and diesel exhaust. In particular, Representative Brown requested that the inspector investigate by April 2013 whether or not the agency had been authorized to expose people to particulates, had obtained informed consent from those exposed, and had dealt with negative externalities. Senator James Inhofe (R-OK) argued September 28 for congressional oversight of the studies.