Leakage from gas pipes can cause hazardous conditions for workers. As piping systems become more complex and aged, it is vital to monitor for possible leaks caused by corrosion, geophysical activity or other external causes. Methane is an aggressive greenhouse gas, determined to be more than 20 times more impactful to the environment than carbon dioxide. Operationally, leaks not only cause unwanted losses and production downtime, they result in costly reactive repairs and regulatory fines. QED offers fast, accurate instruments to detect and quantify surface emissions and leaks before they can become a larger problem.