The debate about effects of Barnett Shale drilling and production on air quality in the Dallas-Fort Worth area continues. The debate started when Al Armendariz, then a professor at Southern Methodist University, published a study in 2009 concluding that increased drilling activity in the DFW area would greatly increase polllution and ozone levels. Armendariz postulated that in the nine counties included in the D-FW metroplex area, gas drilling produced about 112 tons per day of pollution, compared with 120 tons per day from vehicle traffic. His study was sponsored by the Environmental Defense Fund, and was heavily criticized by industry. Armendariz was later appointed head of the Dallas office of the EPA, and resigned earlier this year amid Congressional criticism of remarks he made about EPA enforcement policies.
As a result of Armendariz’s study, the Texas Commission on Environmental Quality installed automatic air monitors at locations within the Barnett Shale area. Eight automatic gas chromatographs now sample air twenty times each day for 46 volatile organic compounds. The monitors cost $250,000 each and cost $100,000/year to operate. Readings from the sample analyses are posted by the TCEQ and can be found here. According to an analysis by Powell Shale Digest, none of the 236,120 air samples taken by these devices have shown amounts of VOCs exceeding limits set by the Environmental Protection Agency.
There are also sixteen samplers in the DFW area that measure ozone. Powell’s analysis of that data shows that ozone levels in the Barnett Shale have been dropping even as drilling activity in the area increased:





