RT Journal Article SR Electronic T1 Asthma hospitalisations and air pollution JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 1076 OP 1077 DO 10.1136/thoraxjnl-2016-209009 VO 71 IS 12 A1 B Barratt A1 J K Quint YR 2016 UL http://thorax.bmj.com/content/71/12/1076.abstract AB