1. Perez L, Rapp R, Künzli N. The Year of the Lung: outdoor air pollution and lung health. Swiss Med Wkly 2010;140:w13129
2. Thurston GD, Kipen H, Annesi-Maesano I, Balmes J, Brook RD, Cromar K et al. A joint ERS/ATS policy statement: what constitutes an adverse health effect of air pollution? An analytical framework. Eur Respir J 2017;11:49. pii: 1600419
3. WHO. Regional Office for Europe. Health effects of transport-related air pollution. Krzyzanowski M, Kuna-Dibbert B, Schneider J, eds. Copenhagen: World Health Organization Regional Office for Europe 2005
4. Dick S, Doust E, Cowie H, Ayres JG, Turner S. Associations between environmental exposures and asthma control and exacerbations in young children: a systematic review. BMJ Open 2014;4:e003827
5. Neuman A, Hohmann C, Orsini N, Pershagen G, Eller E, Kjaer HF et al. Maternal smoking in pregnancy and asthma in preschool children: a pooled analysis of eight birth cohorts. Am J Respir Crit Care Med 2012;186:1037–43