Most firms currently employ activated carbon to filter their exhaust gases before releasing them into the atmosphere. But a few companies are beginning to build zeolite concentrate rotor systems (ZCRS). These systems filter out and incinerate toxins which are produced in the burning process.
目前大部分的廠商是以洗滌塔與活性碳過濾廢氣，再排放到大氣中，少數廠商則已設置沸石濃縮轉輪設備，也就是在燃燒和吸附的過程中，將廢氣中的有毒物質濾出燒掉。