The Star-Telegram is reporting on a recent air study published in the journal Science of the Total Environment: "A review of air quality in the Barnett Shale using data from the Texas Commission on Environmental Quality finds that emissions related to natural gas production are below levels that would pose health concerns. *** The study looked at 4.6 million measurements of targeted chemical compounds captured by seven monitors at six sites in the area from 2000 to 2011. Those monitors, part of a TCEQ network, either automatically sample the air once an hour daily or collect one air sample for 24 hours every sixth day."