As PCB factory china knows that, PCBs can be released into the air, water, and soil from a variety of sources. PCBs can be released into the air through burning of products containing PCBs, manufacturing of PCB-containing products, and disposal of PCB-containing products in landfills. PCBs can be released into water through spills and leaks of PCB-containing products, and they can be released into soil through spills, leaks, and disposal of PCB-containing products in landfills.