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Hydrocarbons are major components of crude oil,but are considered harmful to human health,especially polycyclic aromatic hydrocarbons (PAHs),which are mainly generated by incomplete combustion.The existence of PAHs is not limited to fossil fuels,because the complex aromatic polymer lignin accounts for a quarter of the land-based biomass on Earth,therefore the buming of sugarcane also generates PAHs.Currently at least 922 PAH structures are documented.More recently,it is reported that PAHs take part in formation of urban haze.