RT Journal Article SR Electronic T1 Why an ERJ series on air pollution? JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 12 OP 13 DO 10.1183/09031936.00072712 VO 40 IS 1 A1 Isabella Annesi-Maesano A1 Joachim Heinrich A1 Jon G. Ayres A1 Francesco Forastiere YR 2012 UL http://erj.ersjournals.com/content/40/1/12.abstract AB