| Human Exposure Software Group | Neil Klepeis | 16 | Members of this group are involved with development of software related to human exposure research | subscribe |
| Project Contributors Group | Neil Klepeis | 8 | This group contains members who contribute research materials as part of a specific project | subscribe |
| Researchers Group | Neil Klepeis | 15 | Members of this group post general interest research topics | subscribe |
| Stanford Exposure Analysis Group | Neil Klepeis | 7 | Research group at Stanford University dedicated to measuring and modeling human exposure | Invite only |
| Tobacco Smoke Exposure Working Group | Neil Klepeis | 18 | This group's members are involved in monitoring secondhand tobacco smoke or in developing or testing monitoring methods, especially real-time methods | subscribe |
| Wood Smoke Group | Neil Klepeis | 11 | This group contains members who have an interest in wood smoke emissions | subscribe |
