Pourazar J, Mudway IS, Samet JM, Helleday R, Blomberg A, Wilson SJ, et al. 2005. Diesel exhaust activates redox- sensitive transcription factors and kinases in human air- ways. Am J Physiol Lung Cell Mol Physiol 289:L724–L730. Rabinovitch N, Strand M, Gelfand EW. 2006. Particulate levels are associated with early asthma worsening in children with per- sistent disease. Am J Respir Crit Care Med 173:1098–1105. Sawyer G, Miles J, Lewis S, Fitzharris P, Pearce N, Beasley R. 1998. Classification of asthma severity: should the international guidelines be changed? Clin Exp Allergy 28(12):1565–1570. Spira-Cohen A, Chen LC, Kendall M, Sheesley R, Thurston GD. 2010. Personal exposures to traffic-related particle pollu- tion among children with asthma in the South Bronx, NY. J Expo Sci Environ Epidemiol 20:446–456. Suglia SF, Gryparis A, Schwartz J, Wright R. 2008. Association between traffic-related black carbon exposures and lung function among urban women. Environ Health Perspect 116:1333–1337. Thurston GD, Bates DV. 2003. Air pollution as an underappreci- ated cause of asthma symptoms. JAMA 290(14):1915–1917. Thurston GD, Lippmann M, Scott MB, Fine JM. 1997. Summertime haze air pollution and children with asthma. Am J Respir Crit Care Med 155:654–660. Trasande L, Thurston GD. 2005. The role of air pollution in asthma and other pediatric morbidities. J Allergy Clin Immunol 115(4)689–699. Trenga CA, Sullivan JH, Schildcrout JS, Shepherd KP, Shapiro GG, Sally Liu LJ. 2006. Effect of particulate air pol- lution on lung function in adult and pediatric subjects in a Seattle panel study. Chest 129:1614–1622. Traffic air pollution and asthma U.S. EPA. 2004. Air Quality Criteria for Particulate Matter. EPA/600/P-99/002aF. Research Triangle Park, NC:National Center for Environmental Assessment, Office of Research and Development. U.S. EPA 2008. Integrated Science Assessment for Sulfur Oxides—Health Criteria. EPA/600/R-08/047F. Research Triangle Park, NC:National Center for Environmental Assessment, Office of Research and Development. Von Klot S, Wolke G, Tuch T, Heinrich J, Dockery DW, Schwartz J, et al. 2002. Increased asthma medication use in association with ambient fine and ultrafine particles. Eur Respir J 20:691–702. Environmental Health Perspectives • volume 119 | number 4 | April 2011 565