6Braga AL,Saldiva PH,Pereira LA,et al. Health effects of air pollution exposure on children and adolescents in Sao Paulo, Brazil [J]. Pediatric Pulmonology ,2001,31 (2) :106 - 113.
7Schwela D. Air poUution and health in urban areas [ J]. Rev Environ Health,2000,15(1 -2) :13 - 42.
8Oberdorster G. Pulmonary effects of inhaled ultrafine particles[ J]. Int Arch Occup Environ Health,2001,74: 1 - 8.
9Furtaw El Jr. An overview of human exposure modeling activities at the USEPA' s National Exposure Research Laboratory[ J]. Toxico Ind Health,2001,17(5 -10) :302 -314.
10Chen Y, Yang QY, Krewski D, et al. Influence of relatively low level of particulate air pollution on hospitalization for COPD in elderly people [ J ]. Inhalation Toxicology,2004,6: 21 - 25.