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Lead is widely understood to be toxic to multiple organs of the human body, particularly the human brain. Concerns about even low levels of exposure began in the 1970s; in the decades since, scientists have concluded that no safe threshold for lead exposure exists. [2] [3] The major source of lead exposure during the 20th century was leaded ...
Classically, "lead poisoning" or "lead intoxication" has been defined as exposure to high levels of lead typically associated with severe health effects. [20] Poisoning is a pattern of symptoms that occur with toxic effects from mid to high levels of exposure; toxicity is a wider spectrum of effects, including subclinical ones (those that do ...
Metal toxicity or metal poisoning is the toxic effect of certain metals in certain forms and doses on life.Some metals are toxic when they form poisonous soluble compounds. . Certain metals have no biological role, i.e. are not essential minerals, or are toxic when in a certain for
Blood lead level (BLL), is a measure of the amount of lead in the blood. [1] [2] Lead is a toxic heavy metal and can cause neurological damage, especially among children, at any detectable level. High lead levels cause decreased vitamin D and haemoglobin synthesis as well as anemia, acute central nervous system disorders, and possibly death. [3]
Psychological hazards are aspects of work and work environments that can cause psychological harm or mental ill-health. These include factors such as stress, workplace bullying, fatigue, burnout, and violence, among others. These hazards can lead to psychological issues like anxiety, depression, and post-traumatic stress disorder (PTSD).
A 2009 Canadian–American study concluded that even at levels that are considered to pose little to no risk, lead may cause "adverse mental health outcomes". [257] Its prevalence in the human body—at an adult average of 120 mg [t] —is nevertheless exceeded only by zinc (2500 mg) and iron (4000 mg) among the heavy metals. [259]
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One of the largest factors in worsened mental health due to noise pollution is annoyance. [60] [61] Annoyance due to environmental factors has been found to increase stress reactions and overall feelings of stress among adults. [55] The level of annoyance felt by an individual varies, but contributes to worsened mental health significantly. [61]