Many oil fields, especially mature ones, can produce high levels of Hydrogen Sulfide (H2S), which is deadly at even low concentrations. As drilling and completions are often in remote locations, getting to the nearest hospital in time to respond to an exposure event could be impossible. It is always crucial to be able to detect the gas as soon as possible when a leak occurs, in even the most challenging conditions. It is important to remember that detection coverage for H2S in facilities where it is known to be present is an ongoing program that needs to be constantly evaluated and updated. Many facilities have constantly changing conditions with connections that are affected by the highly corrosive properties of H2S. Some facilities simply do not have adequate coverage or don’t completely understand the options available to protect their plant and the people who work there. This article will explore the various technologies available and their application in order to maximize coverage of this serious threat.