From Pathfinder Adventure Path: Hell's Destiny, which isn't enabled.

Alchemical Cloud

HAZARD 12

Stealth +15 (master)

Description The collection of bottles at the bottom of one locker have been jostled. Their contents leak into a puddle, and their vapors burn through the open air.

Disable DC 30 Crafting (master) to neutralize the alchemical substances, or DC 35 Thievery (expert) to carefully clean the spill

Leaking Reagents (inhaled, poison)

Trigger A creature fully opens the locker containing the alchemical clutter

Effect A cloud of vapor deals 8d10 poison damage to all creatures within 10 feet (DC 36 basic Reflex save). On a failure, a target takes an additional 2d10 persistent poison damage.

Reset If the reagents aren't cleaned up before closing the locker, the accumulating gases reset the trap after 1 hour.

Pathfinder Adventure Path: Hell's DestinyORC