Chimney Safety Institute of America (CSIA) Certification Practice Test

What is a major component of smoke from smoldering wood?

1. Carbon monoxide

2. Tar droplets

3. Ash particles

4. Water vapor

The correct answer is: Tar droplets

A major component of smoke from smoldering wood is indeed tar droplets. When wood burns not fully or at lower temperatures, as is the case with smoldering, it produces various organic compounds, including tars, which are sticky and can condense from the smoke. These tar droplets can contribute to the formation of creosote in chimneys, a substance that poses significant risks for chimney fires if not regularly cleaned. While carbon monoxide, ash particles, and water vapor are also present in smoke from burning wood, the distinction lies in the fact that tar droplets specifically are byproducts of incomplete combustion, making them a prominent concern for chimney safety due to their potential for buildup and the hazards they represent. Understanding this helps emphasize the importance of proper combustion techniques and chimney maintenance to reduce such risks.