Sources:


California Department of Heath Services.  “California Asthma Facts: Volume 1, Issue 1.”  [Updated May 2003; cited 16 July 2003].  Available from http://www.dhs.ca.gov/ehib/ehib2/topics/asthma.html.

Healthy People 2010 Information Access Project.  Respiratory Diseases. 

California Air Resources Board.  Particulate Matter.  [Updated 31 October 2002; Cited 25 July 2003].  Available from http://www.arb.ca.gov/research/aaqs/caaqs/pm/pm.htm.