The hazards of chalk dust
SCT Digital Technology Co.,ltd.
Chalk as a common teaching tool, its main component is sulfate calcium, with stable performance, it is non-toxic from the composition, but because chalk dust has a strong bacteria adsorption ability, if exposed in the dust environment for a very long time, it is very easy to cause damage to the respiratory system of human beings.
The hazards of chalk dust
The danger of chalk ash to body is conspicuous to lungs. In the process of teaching, chalk ash is inevitably inhaled into the lungs, and most of it is blocked in the alveoli, causing lung damage, including respiratory inflammation and decreased pulmonary ventilation function. Common lung diseases include: chronic, acute pneumonia, lung cancer, pneumoconiosis, etc.
The harm of the upper respiratory tract: dust through the upper respiratory tract into the lungs, including the nose, throat, bronchial, in this process, some dust will stay in the upper respiratory tract, produces mechanical stimulation and damage to mucosal epithelial cells, induce drying rhinitis, its symptoms are dry nose, nasal congestion, nasal mucosal hyperemia, secretion, etc;
The influence to pharynx is to induce chronic pharyngitis mainly, make pharynx ministry dry, cough up phlegm ailment, pharynx is painful pharynx urticant;
The main effect on the bronchi is to induce chronic bronchitis, including asthma.
Damage to the eyes: the eyes are one of the most delicate and easily damaged organs in the human body. If the teacher is in teaching process, chalk dust falls into the eye carelessly, stimulate lacrimal gland secrete, will stimulate eye ministry mucous membrane possibly, cause mucous membrane damage, form chronic inflammation, induce the generation of myopia.
Harm to the skin: teachers in the teaching process, chalk dust is hard to avoid on the body, after mixing with sweat, it is very easy to cause irritation to the skin membrane, so that the skin becomes dry, rough, and accompanied by itching feeling, seriously it will cause acne, hair folliculitis, pyoderma, chapped skin and hair loss.
According to the centers for disease control and prevention, it shows:
The prevalence of pharyngitis among teachers over 5 years reached almost 100%, that of asthma 43%, rhinitis 39%, pneumoconiosis 11.76%, and bronchitis 8%. In addition, the incidence of cancer among full-time teachers accounts for 20% of the total incidence of cancer in China, 8 times of the general population, due to the super adsorption capacity of dust.
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