How can energy efficiency and renewables contribute to reducing air pollution in urban areas?

• A. Reducing fossil fuel use lowers emissions of PM, NOx, and SOx; renewables generate electricity with little to no local emissions, improving air quality.
• B. They increase urban air pollution due to construction.
• C. They have no effect on air quality.
• D. They only affect global CO2, not local pollutants.

Answer: (A)

The idea being tested is how reducing energy use and shifting to cleaner electricity cut local air pollution. When energy efficiency lowers the demand for power and heat, fewer fossil fuels are burned in urban power plants and vehicles, which reduces emissions of fine particles (PM), nitrogen oxides (NOx), and sulfur oxides (SOx) that harm air quality. Replacing fossil electricity with renewables means electricity is generated with little to no local emissions, so the city experiences fewer pollutants where people live and breathe. This combination directly improves urban air quality and health outcomes by cutting the main locally emitted pollutants.

Other options miss the direct link to urban air quality: construction-related emissions are not the primary driver of daily urban pollution, and these strategies do more than just affect global CO2—they reduce local pollutants as well. Renewables do reduce local pollution, not just global greenhouse gases.