The period of occupational health examination for confirmed observation objects and pneumoconiosis patients is several times a year.

1 time. Exposure to dust is mainly silica dust, and the period of occupational health examination for confirmed observation objects and pneumoconiosis patients or on-the-job personnel exposed to noise, high temperature, poison and radiation is 1 time per year. The period of occupational health examination for confirmed observation objects and pneumoconiosis patients shall be stipulated by the relevant local health departments or medical institutions.