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The lights for night illumination of the cities if used without criterion increasing the brightness of the sky could provoke a pollution of chemical type, at least from the results of a study that would have shown that emissions from human activities would be partially cleared during the course of night, but this mechanism would be hindered for cause of a chemical reaction caused by light at night that would make it difficult then even from the action of the sun that not helps to further dissolve these pollutants components. From the results of this research would seem important to try to point down the lights illuminated at night, making sure that they are not reflected back to the top so it does not promote the effect of increased lighting at night (a phenomenon of light pollution for years reported just as not "healthy" also for the observation of the sky).

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Telephone: +39 338 1809310 Date: 17/12/2010 article n°: 1451 _____________________________________________________________________________________________________