If I recall, Spock and Joe Tormolon were wearing bio hazard suits
Four things speak against that.
1) The suits factually offered no protection. Gloves on or gloves off, the hoods were nowhere near airtight, and neither were the glove/sleeve connections.
2) The team did not believe in any sort of a biohazard until after Spock made the determination. Why would they have worn biohazard suits?
3) Whatever Joe Tormolen wore, he did not believe it would protect him against biohazards. Else why remove the glove?
4) Conversely, Spock (after belatedly deciding that there might be a biohazard even though the sensors apparently still say zip) thinks it's necessary to specifically tell Tormolen not to expose himself to anything - this would not be an issue if Tormolen wore protection.
More probably, those things were just cold weather gear, as sensors readily showed it was freezing cold down there. But no sensor showed pathogens..
Timo Saloniemi