What is a disadvantage of incineration?

• A. Generates renewable energy
• B. Produces air pollution and toxic ash that must be landfilled
• C. Improves soil quality
• D. Reduces greenhouse gas emissions

Answer: (B)

Burning waste through incineration reduces the amount of trash, but the big downside is the pollutants it releases. Combustion sends air emissions such as fine particles, sulfur and nitrogen oxides, and often dioxins and furans into the atmosphere, which can harm health and require complex pollution-control systems to minimize. In addition, the process generates bottom ash and fly ash, and the fly ash is typically contaminated with toxic metals and organic compounds, making it hazardous waste that must be landfilled or otherwise treated. This combination of air pollution and hazardous ash disposal is the primary disadvantage of incineration, outweighing any potential energy recovery benefits. The other options describe scenarios that aren’t inherent drawbacks—incineration can generate energy, it does not improve soil quality, and its effect on greenhouse gases is context-dependent rather than a straightforward disadvantage.