Anti-spore armor—it protects you from spore accumulation.

If the armor's protection value is equal to or higher than the location's infestation level, spores won't be accumulating passively.

You can see the infestation level on the location preview (number icon).

Consumables:

Protective Spray, Iodine, Inhaler—temporarily increase protection or remove the effect.

Spore Blocker—temporarily increases protection against spores. Especially useful in heavily infected locations.