The worst firewood to burn in a residential fireplace includes unseasoned green wood, softwoods with excessive sap like damp pine or fir, driftwood salvaged from saltwater environments, and treated or painted lumber. Wet green wood produces heavy, choking smoke and minimal heat because energy is wasted boiling trapped water. Saltwater driftwood releases hazardous chlorine gas and toxic chemical fumes when ignited. Furthermore, burning chemically treated wood or manufactured composite boards releases dangerous carcinogenic dioxins and heavy metals into the air, posing severe health hazards and ruining indoor air quality.
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