The declaration of occupational hazards in coal mines shall be declared once a year.

Excuse me, "Can coal mines only declare occupational hazards once a year?" Coal mines can only be declared once a year.

According to national regulations, occupational hazards are declared once a year. Occupational hazards refer to all factors or conditions that may adversely affect the health, safety and working ability of occupational groups.

The contents of the occupational hazard declaration mainly include: the basic information of the production and business units, the production technologies, processes and materials that produce occupational hazard factors, and the types, concentrations or intensities of occupational hazard factors in the workplace.