5. Conclusion hydrocarbons hydrocarbons. Chemical 5.1 Organic material that comes from plants and animals is converted not only to solid fuels but also to gas and liquid fuels. Biomass is attracting attention as a renewable energy source, because organic materials in biomass can be regenerated in a short time period from carbon dioxide, a global warming gas, in the atmosphere. 5.2 As mentioned in this report, combustion of this biomass produces various hazardous chemicals, including PAHs and their derivatives. It will be essential to develop technology to prevent these harmful substances from being released into the air, both outdoors and indoors. 5.3 On Al-Daghri, N.M., Alokail, M.S., Abd-Alrahman, S.H., Draz, H.M., Yakout, S.M. and Clerici, M. (2013) Polycyclic aromatic hydrocarbon exposure and pediatric asthma in children: a case- control study. 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(2020) Polycyclic aromatic hydrocarbon exposure results in altered CRH, reproductive, and thyroid hormone concentrations during human pregnancy. Science of The Total Environment, 749: 141581. Chen, Y., Du, W., Shen, G., Zhuo, S., Zhu, X., Shen, H., Huang, Y., Su, S., Lin, N., Pei, L., Zheng, X., Wu, J., Duan, Y., Wang, X., Liu, W., Wong, M. and Tao, S. (2017) Household air pollution and personal exposure to nitrated and oxygenated polycyclic aromatics (PAHs) in rural households: Influence of household cooking energies. Indoor Air, 27: 169–178. 10.1111/ina.12300 Chuesaard, T., ThanChetiyanukornkul, T., Kameda, T., Hayakawa, References the other hand, although Polycyclic Aromatic Hydrocarbons from Vegetation Burning and Health Effects restrictions on incineration of post-harvest crop residues have been implemented in developed countries, it is still practiced in developing countries. 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