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    Location of the automatic sensors belonging to the Network of Vigilance and Prevision for Atmospheric Pollution of Catalonia (XVPCA), with measurements of pollutants and meteorologic parametres. The XVPCA is a detection system which measures inmission levels of the main pollutants. It has been created to complywith Law 22/1983, of 21st Novembre, and its Order of 20th June 1986, and it is administratively run by the Environment and Housing Department of the Generalitat de Catalunya (DMAH-GenCat).

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    Location of the current manual sensors belonging to the Network of Vigilance and Prevision for Atmospheric Pollution of Catalonia (XVPCA), with measurements of pollutants and meteorologic parametres. The XVPCA is a detection system which measures inmission levels of the main pollutants. It has been created to complywith Law 22/1983, of 21st Novembre, and its Order of 20th June 1986, and it is administratively run by the Environment and Housing Department of the Generalitat de Catalunya (DMAH-GenCat).

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    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.

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