This yearlong investigation examined the amount of natural gas flaring in the Eagle Ford shale formation south of San Antonio, and its impact on air quality and the lives of area residents. We were the first publication to use state records to show how much gas was being flared, and how much it was polluting the air. The major findings: the oil field was burning enough gas to fuel all of San Antonio for a full year, and the pollution exceeded that of six large oil refineries in Corpus Christi, Texas. We also found that the state failed to enforce regulations on some of the largest polluters, and that some of the companies flaring the most gas had never applied for permits. The state cited the companies based on our findings.