I decided to make a custom civ using the ammonia-based trait. The first screen snapshot below shows the tooltip that appears when I hover over the pollution level for my home world. The text, which says "High Pollution reduces the Growth of citizens ...", does not look right for an ammonia-based civ.
The second screen snapshot below shows the tooltip that appears when I hover over the "Next Citizen" area. This does reflect that the citizen growth rate increases with pollution.

