The helicopter has the ability to operate from small spaces. Its ability to hover and fly slowly efficiently allows it to perform tasks such as surveillance and rescue even in an urban environment. It is however its ability to provide a form of transport into urban communities where surface transport is restricted by the number of routes and/or congestion, as well as to smaller but less readily reached locations that attracts much attention. The development of cost effective helicopters, as well as commercial helicopters with a larger payload indicate that the world is entering another phase in VTOL travel. It is therefore natural that one should consider the environmental factors in such operations.