Abstract: A mobile apparatus is provided for the recovery of emissions produced by the loading of cargos containing volatile organic compositions at land based or marine based terminals such as offshore oil produciton rigs. Hydrocarbon emissions have been found to elevate ozone levels in the lower atmosphere and the invention substantially eliminates these emissions by recovering the hydrocarbons emitted. The mobility of the apparatus offers the possibility of low cost use in terminals having a low cargo throughput by providing a high on-stream factor due to the ability to move the apparatus from one terminal to another as required.