Natural fog itself is generally not inherently harmful to healthy individuals, as it is simply a cloud resting near the ground composed of condensed water vapor. However, breathing in dense fog can sometimes exacerbate respiratory conditions such as asthma, bronchitis, or chronic obstructive pulmonary disease due to the high moisture and particulate concentration. Furthermore, in urban or industrial areas, fog can trap air pollution, smoke, and chemical smog near the surface, creating hazardous environmental conditions known as smog that pose significant health risks when inhaled over extended periods.
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