Yalosian

The Yalosians are a sapient extraterrestrial species which breathes an atmosphere composed of 60% nitrogen, 10% benzene and 30% hydrogen fluoride.

In 2371, a Yalosian ambassador paid a visit to the Deep Space 9 station an had special quarters prepared for him. However, Major Kira found out that the Yalosian atmosphere was so corrosive she had to remove the carpet because it was being damaged. Dr. Bashir also advised her not to include any red or orange decoration, because Yalosians are not able to see that part of the light spectrum.

Appearances

 * Star Trek: Deep Space Nine, s03e20, "Improbable Cause" (1995)