Air Quality Issues: Construction Sites

Photo: Jerome Courshon, March 9, 2012.  (Click on photo to enlarge.)  The DWP has moved onto Rockeby from Glendale Blvd.  They're digging just a few feet from homes and businesses, without dust screening on the nearby construction fence.  Neighbors are complaining of inadequate wetting of the site and lose dirt blowing in the wind.  Why are we talking about dust?  Particulate Matter,