Discussion
Emissions escaping from valves, tanks and transfer points rather than through a stack are _____ emissions.
Answer: B
Correct answer: fugitive
Fugitive emissions escape from valves, flanges, pump seals, tanks, transfer points, stockpiles and haul roads rather than passing through a stack or vent.
Because there is no single flow to measure, they are estimated from leak detection surveys and emission factors rather than from monitoring, which makes them one of the more uncertain parts of an inventory. They are also frequently large - at refineries and chemical works, fugitive losses of volatile organic compounds can exceed the stack emissions of the same substances.
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