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Tranquility
Tranquillity is a fast diminishing and non-renewable resource in today's rapidly changing world. The Council for the Protection of Rural England has undertaken a process known as tranquillity mapping and have contrasted the state of noise in the environment in the 1960s with that of 1990s. Figures 1 and 2 are reproduced from the CPRE website (http://www.cpre.org.uk/policy/rural/tranquil/index.htm). They show the progressive loss of tranquil places; each centre of noise pollution has spread out to absorb its hinterland. Once a tranquil place has been contaminated it is increasingly polluted.
 
The criteria on which the map was based seem fairly lax when we think of the environment in Mid Wales. The criteria were as follows.
�Tranquil Areas are places which are sufficiently far away from the visual or noise intrusion of development or traffic to be considered unspoilt by urban influences. They are determined by distances from the various disturbing factors listed below. Deciding on the distances has been an iterative process of comparison between each type of disturbance in the field.
The maps provide a broad brush picture of areas in the countryside which are free from urban intrusion.