Assembly Membership
When a person becomes a member of the American Thoracic Society he or she is entitled to become a "primary member" of one Assembly and "secondary member" of two additional Assemblies. Of the 13,608 ATS members (as of January 20, 2012) 11,379 have declared a primary Assembly. Please see the list below for the numbers of primary members only and primary & secondary members in each Assembly:
| Assembly | Primary members | Primary (U.S. only) | Primary & secondary members | Primary & secondary (U.S. only) |
| Allergy, Immunology and Inflammation (AII) | 1345 | 833 | 3087 | 1808 |
| Behavioral Science (BSA) | 101 | 84 | 342 | 250 |
| Clinical Problems (CP) | 2333 | 1525 | 4325 | 2852 |
| Critical Care (CC) | 2495 | 1997 | 4265 | 4265 |
| Enviromental Occupational Health (EOH) | 416 | 295 | 1086 | 751 |
| Microbiology, Tuberculosis and Pulmonary Infections (MTPI) | 696 | 434 | 2280 | 1449 |
| Nursing (NUR) | 92 | 82 | 165 | 129 |
| Pediatrics (PEDS) | 921 | 693 | 1403 | 1046 |
| Pulmonary Circulation (PC) | 622 | 473 | 2237 | 1686 |
| Pulmonary Rehabilitation (PR) | 126 | 62 | 439 | 243 |
| Respiratory Cell and Molecular Biology (RCMB) | 1051 | 714 | 2683 | 1737 |
| Respiratory Structure and Function (RSF) | 721 | 416 | 2416 | 1506 |
| Sleep and Respiratory Neurobiology (SRN) | 460 | 265 | 1566 | 1008 |
| Genetics & Genomics (GG): | 445 members | |||
| Terrorism & Inhalation Disasters (TID) | 280 members | |||
| Thoracic Oncology | 505 members | |||
| Members with NO Assembly Affiliation | 2229 members | |||
Last Updated: January 2012
