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DOI: 10.1038/35008121 42

This research did not receive funding

7.2.2 Fuel selection and combustion efficiency The fuel source exerts profound influence on PAH formation: Clean fuel hierarchy: Electric and gas grills (best): Cleanest combustion, minimal smoke generation, easy temperature control White charcoal (binchotan-style): High-carbon content, produces minimal smoke once ignited, maintains steady heat Quality hardwood charcoal: Moderate smoke production, acceptable if fully ignited before cooking begins Raw hardwood: High smoke generation but potentially acceptable for brief smoking if proper species selected Low-quality charcoal, softwoods, treated wood (poor): High smoke, variable combustion, potential chemical contaminants Plastics, tires, petroleum products (unacceptable): Extremely high PAH levels, heavy metals, dioxins Practical transitions: In African contexts, electric grills face barriers of electricity access and high capital costs

Fonk, T