Where I live, in the Dallas - Fort Worth area of Texas, by far the worst pollution days are days when the sky is blue and the sun shining brightly.

High winds have been driving some fires eastward, closer to the densely populated Dallas-Fort Worth area.

As well as saving money, this makes it possible to extract gas from below urban areas-and, as with the lucrative Barnett shale, from under the Dallas-Fort Worth airport.