Why do companies need to do environmental quality testing, construction projects, occupational hazards pre-evaluation and control assessment?

How can I say this, from the big side of the state requirements, from the small side of this is the enterprise to the staff, but also to the society responsible for the practice. Environmental testing to see what hazards you have, what should be done to deal with occupational disease is mainly on your workplace hazards and protective measures, workers' physical examination are many aspects of a comprehensive prediction and the actual effect of the summary of these are responsible for the employees of the enterprise, of course, is also responsible for the enterprise. I hope to help you.