In fact, the content of health certificate mainly involves the inspection of infectious diseases, in order to ensure the health and safety of the service industry. Personnel engaged in toxic, harmful and radioactive operations do not belong to the service industry and do not need to hold health certificates at all, so it cannot be said that health certificates are an effective way to understand physical condition and ensure health and safety. Health certificates can be used across cities. This mainly depends on the specific provisions of the place of use and the span of the use area in different places. No matter whether it is across cities, counties or provinces, health certificates cannot be used across provinces, because the specific requirements and standards for handling and issuing health certificates in different provinces are obviously different. Generally, it can be used in the same province, especially in the jurisdiction of the same city and county, but it mainly depends on the specific requirements of the place of use. For example, some municipal health certificates are only used locally, and local health certificates must be handled by health and epidemic prevention institutions within their respective jurisdictions.
Legal basis: Article 45 of the Food Safety Law of People's Republic of China (PRC), food producers and business operators shall establish and implement the health management system for employees. Persons suffering from diseases that hinder food safety as stipulated by the administrative department of health of the State Council shall not engage in direct contact with imported food. Food production and marketing personnel engaged in direct contact with imported food shall undergo annual health examination and obtain health certificates before taking up their posts.