Fig. 1: Schematic of tunnel and traffic characteristics. | npj Climate and Atmospheric Science

Fig. 1: Schematic of tunnel and traffic characteristics.

From: Emissions and potential tracer screening of semivolatile/intermediate-volatility organic compounds from urban vehicle fleets

Fig. 1

a Layout of the Wujinglu tunnel. Site1# and 2# refer to the two sampling locations at the tunnel entrance and exit, respectively. b Diurnal variation of traffic flow and vehicle speed; the shaded areas (blue and purple) represent ±1 standard deviation based on data collected over multiple days. c Fleet composition and d vehicle emission standards observed in the tunnel during the campaign; GVs, HEV, NG, and DVs represent gasoline vehicles, hybrid electric vehicles, natural gas vehicles, and diesel vehicles, respectively.

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