What is the impact of hydropower on air pollution?

What is the impact of hydropower on air pollution?

• A. Hydropower does not produce air pollution once in operation
• B. Hydropower increases air pollution
• C. Hydropower emits significant CO2 during operation
• D. Hydropower relies on burning water to generate energy

Answer: (A)

The key idea is that hydropower generates electricity without burning fuels, so there are no direct air pollutants released during normal operation. Because there’s no combustion, the plant itself doesn’t emit CO2, NOx, SOx, or particulates while it’s running, making its impact on air quality essentially zero compared with fossil-fuel plants. The other statements don’t fit because they imply emissions from operation or a mechanism (burning water) that doesn’t occur in hydro plants. Note there can be some emissions over the plant’s life cycle, such as during construction or from reservoir methane, but these are not emissions from normal operation and are generally much smaller than fossil-fuel power sources.

The key idea is that hydropower generates electricity without burning fuels, so there are no direct air pollutants released during normal operation. Because there’s no combustion, the plant itself doesn’t emit CO2, NOx, SOx, or particulates while it’s running, making its impact on air quality essentially zero compared with fossil-fuel plants. The other statements don’t fit because they imply emissions from operation or a mechanism (burning water) that doesn’t occur in hydro plants. Note there can be some emissions over the plant’s life cycle, such as during construction or from reservoir methane, but these are not emissions from normal operation and are generally much smaller than fossil-fuel power sources.