highly significantp = 0.001
Accordingly, a highly significant difference was observed between heavy-low-traffic flow roads in terms of the concentrations of NO 2 (Z = −3.406, p = 0.001), PM 2.5 (Z = −4.099, p = 0.000), and PM 10 (Z = −4.157, p = 0.000) at 95% CI, p < 0.05.