Residential air pollution increases the risk for persistent pulmonary hypertension after pulmonary endarterectomy.

Competing Interests: Conflict of interest: K. Swinnen has nothing to disclose. Conflict of interest: E. Bijnens has nothing to disclose. Conflict of interest: L. Casas reports grants from Research Foundation Flanders (FWO; a post-doctoral fellowship, grant number 12I1517N), outside the submitted work. Conflict of interest: T.S. Nawrot has nothing to disclose. Conflict of interest: M. Delcroix reports grants and personal fees for investigation work, lectures and consultancy from Actelion/J&J, personal fees for investigation work, lectures and consultancy from Bayer, personal fees for lectures and consultancy from MSD, personal fees for investigation work from Reata, personal fees for investigation work and consultancy from Bellerophon, personal fees for consultancy from Acceleron, outside the submitted work. Conflict of interest: R. Quarck has nothing to disclose. Conflict of interest: C. Belge reports personal fees from Actelion/Janssen and MSD/Bayer, outside the submitted work.