Wind patterns are typical of this type of trof with northeasterly winds aloft. Northeastly winds are from the positive tilt of the closed upper level low. The surface winds are starting to come out of the southwest in the afternoon after a cold core high pressure system sets up in Chihuahua that in effect blows wind toward the north. Winds are still light and doesn't allow much of the pollution to disperse. Folks may resort to wood burning because of the brown outs over the area.
The AQI forecast for today is calling for an area of moderate in the Paso del Norte.