From pressurized equipment, there are unintentional emissions of vapors/gases. They are known as fugitive emissions. This could be because of leakage, broken equipment, or any other unanticipated mishap. Besides, fugitive emissions occur through evaporation from wastewater treatment or storage tank facilities. Some of the prime sources of fugitive emission include compressor seals, flanges, valves, pumps in hydrocarbon service, and pressure relief devices. This topic will discuss methods to measure fugitive emissions, methods to generate periodical emission reports, fixed roof tanks, external flat floating roof tanks, external domed floating roof tanks, internal floating roof tanks, variable vapor space, pressure tanks, types of losses from tanks, standing loss, working loss, etc.