Location of alarms to warn the population if there is a chemical risk in the case of an accident in premises nearby.

Identification of the municipalities through which the gas pipeline passes in the operational phase.

It represents the aproximate route of the ethylene pipelines.

It represents the approximate route of the gas pipelines (transport of natural gas).

Polygons which define the range of sound corresponding to the alarms. In accordance with each type of alarm, the sound radius covered can be 800 or 400 metres away from the siren, or maybe unidirectional, covering a distance of 700 m with a 70º opening.