TY - JOUR T1 - Sulphur dioxide levels and asthma. JF - Thorax JO - Thorax SP - 1042 LP - 1042 DO - 10.1136/thx.49.10.1042 VL - 49 IS - 10 AU - A Ponce de Leon AU - H R Anderson Y1 - 1994/10/01 UR - http://thorax.bmj.com/content/49/10/1042.1.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -