Arsenic is a toxic element that affects human health and it is widely distributed in the environment. In the area of study, the main Spanish and second European industrial ceramic cluster, the main source of arsenic aerosol is related to the impurities in some boracic minerals used in the ceramic process. Epidemiological studies on the cancer occurrence in The PM 10 , PM 2.5 and its arsenic content show a sharp decrease in recent years associated with the economic downturn, which hit severely the production of ceramic materials in the area under study. The production decrease due to the economic crisis combined with several technological improvements in recent years such as substitution of boron, which contains As impurities as raw material, have reduced the concentrations of PM 10 , PM 2.5 and As in air to a extent that currently met the existing European regulations. 3