Final answer:
The author uses a persuasive literary structure by not only describing the issue of air pollution from car emissions but also providing a solution and urging the audience to take action by using public transportation.
Step-by-step explanation:
In the text you're referring to, the author began by describing the problem of air pollution due to car emissions in American cities. Following this, the author presented a solution to this problem and tried to convince the audience to take a specific action—using public transportation instead of driving their cars. This fits the characteristics of a persuasive literary structure. The author is not just informing but also trying to persuade or convince the audience to adopt a particular viewpoint or to undertake a specific action. This differentiates it from a purely descriptive, narrative, or expository structure which are more focused on detailing, storytelling, or explaining without necessarily aiming to persuade.