Trouble In The Air: Warmer Temperatures Lengthen Midwest Ragweed Pollen Season February 22, 2011 Expert BlogDr. Kim Knowlton
Nuevos estudios revelan la relación del calentamiento global con las alergias y el asma October 17, 2007 Press Release Increases in Ragweed and Smog Could Produce “Double-Whammy” for Allergy and Asthma Sufferers in Major Cities Throughout the U.S.