The Shandong Seatone Detection Evaluation Co recently did an on-site examination of toxic and harmful substances and worker exposure around the equipment at all plants of the Zhenghe (Group) Co. This early detection activity is one way to protect workers from harmful toxic substances at work and to reduce the number of occupational hazards. The inspection covered 25 types of harmful substances, and unveiled 99 instances, while the concentration of toxic substances was tested for 15 types of work, and for 12 other types of work, and noise pollution was measured at 79 sites, and temperatures, at two sites.