Question

what is one way to make a positive impact on air quality to reduce air pollution?
moving to a large city
using public transportation
planting crops in terraces
releasing gases into the air

Explanation:

Using public transportation reduces the number of individual - vehicle emissions. Moving to a large city usually increases pollution, planting crops in terraces has little direct impact on air quality on a large scale, and releasing gases into the air worsens pollution.

Answer:

B. using public transportation