The Hazmat Suit is a unique armor suit from the Old World Blues DLC that provides the wearer with 85% poison resistance and night vision. It can be found inside a forcefield pod in the Hazmat Testing Ground. The pod must be unlocked with a special security code or with an upgraded Sonic Emitter.

A few tips before I get into the guide:

• Using the upgraded Sonic Emitter lets you skip the first part of this guide. The suit is located inside a pod that is made out of a force field. It’s intended to be disabled with a special security code, however, you can also disable it with an upgraded Sonic Emitter that you get in the “Sonic Emitter Upgrade” main quest.
• Old World Blues DLC required. To get this particular suit of armor, you need to have the Old World Blues DLC installed.

Acquisition

Hazmat Pod Security Code

Note: You can skip this part if you have the Sonic Emitter upgrade.

First, you’ll need to go to the Z-43 innovative toxins plant, located west of the Think Tank.

Once there, use the metal garage door to enter the facility.

Once inside the facility, go straight until you reach the wall opposite the entrance, once there, turn left, and you’ll see a door that leads to another room. Head inside.

Once inside that room, turn to the left. You’ll see several filing cabinets. In front of one of the filing cabinets, there is a small white box.

The code you’re looking for is between that white box and the filing cabinet.

Once you grab the code, you can head out of the facility. 

Hazmat Suit

With either the code or the upgraded Sonic Emitter in hand, you can make your way to the Hazmat Testing Ground, located directly east of the Sink Balcony.

The Hazmat Testing Ground is a ruined, irradiated building with a crater where the ground floor used to be. Enter the building through any of the broken walls.

Directly in the center of the crater is the pod with the Hazmat Suit.

If you have the code, simply interact with the pod to disable the forcefield. If you want to use the upgraded Sonic Emitter instead, then just shoot the force field with it.

Either way, the force field will turn off and you’ll be able to grab the armor.

Stats and Gameplay Tips

Hazmat Darklight Cowl 

While this piece of headgear only provides a DT of 2, it provides the user with permanent night vision. The effect has dubious effectiveness outside of near-pitch-black dark areas, which the game doesn’t have many of.

The best places to use this helmet are caves, particularly the ones in the Lonesome Road DLC. 

Below is a comparison of a typical indoor area (X-8) with and without the Hazmat Darklight Cowl.

Hazmat Suit

Unlike the Darklight Cowl, the Hazmat Suit has a DT of 11, while still being considered light armor. This is well above average, especially when you consider its unique effect: 85% poison resistance. 

85% poison resistance is the maximum possible amount, and being able to reach it without the need for any temporary consumables is (though situationally) very useful.

The best use case for this suit of armor is any sort of fight against Cazadores. Cazadores the bulk of their damage through their poison, and become far less threatening while using this armor.