European Respiratory Journal 2017 49: 1600419; DOI: 10.1183/13993003.00419-2016 George D. Thurston, Howard Kipen, Isabella Annesi-Maesano, John Balmes, Robert D. Brook, Kevin Cromar, Sara De Matteis, Francesco Forastiere, Bertil Forsberg, Mark W. Frampton, Jonathan Grigg, Dick Heederik, Frank J. Kelly, Nino Kuenzli, Robert Laumbach, Annette Peters, Sanjay T. Rajagopalan, David Rich, Beate Ritz, Jonathan M. Samet, Thomas Sandstrom, Torben Sigsgaard, Jordi Sunyer, Bert Brunekreef Abstract The American Thoracic Society has previously published statements on what constitutes an adverse effect on health…