Protection and Planning of Historic Districts Based on Internet of Things Perception

Table 5

Comparison table of speed correction factor values of small vehicles.

Pollutant	Velocity interval (km/h)
	<20	20–30	30–40	40–80	>80
	1.69	1.26	0.79	0.39	0.62
	1.68	1.25	0.78	0.32	0.59
	1.38	1.13	0.90	0.86	0.96