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. Author manuscript; available in PMC: 2018 Sep 7.
Published in final edited form as: Atmos Environ (1994). 2017 Sep 7;165:23–24. doi: 10.1016/j.atmosenv.2017.06.027

Fig. 1.

Fig. 1

Weekday and weekend diurnal variations of (a–d) mean hourly NO2 to NOX ratio at the four near-road measurement locations, (e) total traffic counts, (f) percent heavy-duty traffic counts, (g) sensible heat flux (W/m2). Hours used are only when winds are from the west; the hours between 5 and 7 of the day are highlighted with a grey vertical bar on all plots to highlight the hours of the morning atmospheric transition from stable to convective conditions and where there is a notable difference in the total traffic volumes and heavy-duty traffic percentage between weekdays and weekends on I-15.