The humanoid people of Tagra IV, whose industry has so fouled their atmosphere that they depend on huge baristatic filters, and who are saved from disaster by Amanda Rogers.
The Tagrans are a technological humanoid people of the Argolis Cluster. Rather than change the way they live, they have built large reactors to power baristatic filters that scrub their poisoned air, an approach that Riker and Geordi La Forge regard as treating the symptom instead of the cause. On the surface they must use inhalers to breathe.
They appear in the Next Generation episode True Q. The Enterprise brings supplies and engineering help for the filters, and the scientist Orn Lote deals with the crew, declining most of their suggestions for his outdated equipment.
When one of the reactors heads for an explosion that would kill many thousands, the young intern Amanda Rogers, who has just learned she is a Q, breaks her promise not to use her powers. She stops the overload and clears the entire atmosphere of pollution.