Figure 6From: The air quality impacts of road closures associated with the 2004 Democratic National Convention in BostonConcentration patterns during the Democratic National Convention (July 26–29) versus concentrations during the same days of the week before and after the Democratic National Convention. x-axis = hour of day; y-axis = concentration (μg/m3 for PM2.5 and EC, ppb for NO2)Back to article page