目前我国有毒有害企业超过1600万家,受到职业危害极其威胁的人数超过2亿。我国的职业病形势十分严峻,对职业病的防治和快速发展的经济水平极不适应,职业病已经成为重大的公共卫生和社会问题。在全国报告的各类职业病中,尘肺病占到 At present, there are over 16 million poisonous and harmful enterprises in our country and over 200 million have been extremely threatened by occupational hazards. The situation of occupational diseases in our country is very serious. It is extremely unmanageable for the prevention and control of occupational diseases and the rapid economic development. Occupational diseases have become major public health and social issues. Of the various occupational diseases reported throughout the country, pneumoconiosis accounted for