Anatomically speaking, inhaled dust enters the respiratory tract, but pig blood is eaten in the digestive tract. Respiratory tract and digestive tract are not connected in space. Dust and pig blood have no chance to meet at all. It is probably impossible for pig blood to clear lung.
The word "clearing lung" is a concept of traditional Chinese medicine, which means clearing heat, promoting diuresis and detoxifying. People are familiar with foods that nourish and moisten the lungs, such as pears, white radishes, water chestnuts, lilies, Siraitia grosvenorii and so on. It won't have much impact on healthy people, but people with respiratory diseases will eat some properly, which is beneficial to lung efficiency.
Because the inhaled "dust" will stimulate the human body to produce fire poison, you can eat some foods that detoxify and clear the fire, such as soaking chrysanthemums or honeysuckle with licorice. In addition, many vegetables are rich in carotenoids, which help to improve human immunity, benefit throat and lung mucosa, and indirectly protect the lungs.
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Fine particles such as PM2.5 are inhaled by the human body, swallowed by alveolar cells, or enter the blood through alveoli. They won't stay in the alveolar fossa for you to clean, so it's especially important to take preventive measures. Xiao Zhiquan suggested that citizens in foggy days should minimize outdoor activities, wear protective masks when going out, use air purifiers indoors, wash their skin, mouth and nose after returning home, and take vitamins appropriately to enhance their physical fitness and improve their immunity.
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