| An unfavorable combination of high air temperature, high humidity and, as a consequence, low oxygen content in the ground layer of air can affect the well-being of elderly people, children, people suffering from diseases of the cardiovascular system (primarily those who have suffered a myocardial infarction, stroke, patients with cardiac disorders activities), pulmonary insufficiency, and those susceptible to migraine attacks. In warm weather, blood vessels tend to dilate, so the heart has to do an increased amount of work, which is not always painless for its owner. In addition, on July 9, the well-being of most people will be influenced by the turbulent geomagnetic background. In persons with nervous and psycho-emotional disorders, excessive anxiety and causeless anxiety cannot be ruled out.
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