Title: The effects of asphalt components on the human body - PowerPoint PPT Presentation

Description: Coal tar is a by-product of carbonization of coal and is a liquid or semi-solid substance. Coal tar was once used for road pavement, but it is currently replaced by asphalt and concrete pavement. Coal tar contains more than 300 kinds of aromatic compounds such as benzene, carbonic acid, and cresol, among which carcinogenic substances are said to be contained. In particular, benzo (a) pyrene is a relatively large amount of carcinogens contained in coal tar, and when it is taken into the body, a large amount of active oxygen is generated. Active oxygen is necessary for the body. However, if the amount is too large, it has the effect of damaging clean cells, which leads to carcinogenesis.  I tried to summarize the difference between such coal tar and asphalt. standar pae – PowerPoint PPT presentation