Final answer:
Composting is the correct answer because it is not a technological method to directly improve air quality unlike electrostatic precipitators, installing solar panels, and building wind turbines, which are technological solutions.
Step-by-step explanation:
The question being asked is about identifying which method does not technologically improve air quality. Option (a) electrostatic precipitators are devices used to remove particles from air, making them beneficial for air quality. The development of these precipitators was a significant step toward reducing air pollution. Option (b) installing solar panels is a way to reduce greenhouse gas emissions by producing electricity without burning fossil fuels, thus indirectly improving air quality. Option (c) composting is a natural process of recycling organic material such as leaves and vegetable scraps into a rich soil amendment, but it is not a technological method to directly improve air quality. Lastly, option (d) building wind turbines is also a means to generate electricity without emitting pollutants. Therefore, the correct answer is composting because it is not a technological approach to air quality improvement.