The major route of entry of inorganic mercury into humans is through:

Inorganic mercury primarily enters the human body through inhalation of mercury vapors. This is particularly relevant in occupational settings where mercury is used in processes such as mining, smelting, or in certain industrial applications. When mercury is heated, it can vaporize, allowing individuals in close proximity to inhale the toxic vapors.

Once inhaled, these vapors are readily absorbed into the bloodstream, leading to a range of health issues, including damage to the nervous system, kidneys, and other vital organs. While ingestion of contaminated fish can lead to exposure to methylmercury, which is a different form of mercury (organic), inorganic mercury is associated specifically with exposure through inhalation. Therefore, understanding the routes of exposure is critical for proper health assessments and risk management strategies in environmental health.