Which statement best describes the potential environmental benefits of WMA over HMA?

• A. It typically operates at lower temperatures, reducing fuel use and emissions
• B. It requires more energy than HMA
• C. It cannot be used in cool climates
• D. It eliminates the need for aggregate

Answer: (A)

Warm Mix Asphalt provides environmental benefits mainly because it is produced and laid at cooler temperatures than Hot Mix Asphalt. Those lower temperatures mean less fuel is burned to heat the mix, which reduces energy use and the associated emissions. The cooler process also tends to lessen asphalt fumes and odors and can improve working conditions for crews, contributing to a smaller environmental footprint overall. The other statements don’t fit because WMA is designed to save energy, not require more; it can be used in cool climates with proper formulation and techniques; and it still uses aggregate—the mix isn’t without its mineral content.