Effective Strategies to Reduce Urban Pollution

Read the following passage and answer the question that follows:

Pollution in urban areas has reached alarming levels due to rapid industrialization and increasing vehicle use. Many cities are now implementing various strategies to combat this growing problem. For instance, some municipalities are investing in green public transportation, encouraging cycling, and promoting electric vehicles. Environmentalists argue that these efforts are essential, yet the question remains: what is the most effective approach to significantly reduce urban pollution?