While there is no available evidence that I can track down regarding the toxicity of climbers chalk (magnesite), the American Conference of Governmental Industrial Hygenists have have assigned the chemical a TLV value. This value means that its concentration should not exceed 10mg/mc (while mg refers to milligrams, I am unclear what ‘mc’ refers to — possibly metric cubes?). Any levels higher than this ratio endanger damage to the alveoli in the lungs if humans are exposed to it for over eight hours.
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