This is misleading. You left out children who live closest to heavily-trafficked arterial roadways. Since these are normally more gridlocked than interstates the problem is worse than with interstates. If the same quantity of traffic goes by at an average of 15 mph vs. 30 mph the pollution is worse in the slow condition due to engine efficiencies.
The answer, of course, is to close all roads and/or stop building new roads. and force everyone to take public transportation - which is what many liberal governments are trying to do.
I didn't deliberately leave out anything. It was a general statement. I am not adverse to the increased voluntary use of public transportation, although I don't want it forced down my throat.