The work by Menezes (Footnote 50), which focused on emissions from the thermal degradation of tyres, concludes that a higher number of aromatics and cyclic compounds, such as benzene and furans, were detected at combustion temperatures between 450º C and 650º C. Also in this study, the following primary measures are considered to be critical to avoid the formation and emission of PCDD and PCDF from cement kilns: Quick cooling of kiln exhaust gases to lower than 200°C in long wet and long dry kilns without preheating.
ورؤى في هذه الدراسة أيضاً أن التدابير الرئيسية التالية ضرورية لتجنب تكوين انبعاثات ثنائي البنزين متعدد الكلور متعدد الديوكسينات (PCDD)، وثنائي بنزو فيوران متعدد الكلور (PCDF) من قمائن الأسمنت: