 Purpose of the Study: The purpose of this study is to test the hypothesis that changes in climatic variables, such as temperature, pressure and humidity, and changes of particulate matter 10μ PM10, particulate matter 2.5μ PM2.5, ozone O3, carbon monoxide CO, sulfur dioxide SO2, nitrogen dioxide NO2, are associated with an increase of supraventricular and ventricular arrhythmias. 