The harm of chalk ash mainly is:
1, the harm to the eye: The eye is one of the most precise and vulnerable organs in human organs, the main component of chalk dust, calcium carbonate, calcium oxide is a water-soluble substance, easily dissolved in water, and produce alkaline substances, such as teachers in the teaching process, chalk dust into the eye, stimulate the secretion of lacrimal gland, Tears hydrolysis of calcium carbonate and produce alkaline substances, will seriously stimulate the eye mucosa, resulting in mucosal damage, the formation of chronic inflammation, but also may induce myopia.
2, the harm to the skin: teachers in the teaching process, chalk dust will inevitably be stained in the hand, while floating in the air particles will also fall in the teacher's hair, face and neck, the skin film has a stimulating effect, if summer in sweat solution, produce alkaline substances, the skin mucous membrane stimulation is greater, Because the environment that human skin survives is weak acidic environment, this destroys the basic living environment of the skin under the effect of alkaline dust, and the chalk dust makes the skin dry and coarse, and it is accompanied with itching sensation, making the human body unwell, serious person can cause acne, hair follicle inflammation, purulent skin disease, chapped skin and a lot of hair shedding, affect and interfere with teachers ' normal work and life.
3, the harm to the ear: chalk dust into the external auditory meatus, mixed in the sebum, can form earwax embolism, if the long-term so, will cause inflammation of the ear.
4, the harm to the lungs: dust on the teacher's body harm, most common in the lungs, in the teaching process, the chalk dust is easily inhaled after the lungs, most are blocked in the alveoli, after a series of stimulation, chemical and immune effects can cause lung loss, including respiratory inflammation and pulmonary ventilation function decline, common lung diseases are: chronic , acute pneumonia, lung cancer, pneumoconiosis, etc. (that is, chalk dust contains silica, inhaled lung, in the lungs free of silica content in more than 1% form the lung fibrosis of the dust, so that the alveolar fibrosis, resulting in lung respiratory function decline).