1) I don't know if Xiamen has the same pollution problem as other cities in China. 2) More biking = less cars + exhaust on the roads. 3) Maybe the city is mor

1) I don't know if Xiamen has the same pollution problem as other cities in China. 2) More biking = less cars + exhaust on the roads. 3) Maybe the city is more progressive than others in reducing air pollution (this bike path is one example) so there is less problem with air pollution.