> For the complete documentation index, see [llms.txt](https://kam-1.gitbook.io/kam-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://kam-1.gitbook.io/kam-docs/medical-jap/chemical/02_protection.md).

# Protection Tiers

Every agent is assigned a **protection tier** that tells you what gear you need to survive it. The tier shown in module dropdowns is about *required protection*, not how dangerous the agent is.

| Tier        | Gear required                                                          | Agents             |
| ----------- | ---------------------------------------------------------------------- | ------------------ |
| **Level 0** | None (a mask still protects the airway; eyes are still affected by CS) | CS / Tear gas      |
| **Level 1** | Gas mask                                                               | Chlorine, Phosgene |
| **Level 2** | **Full CBRN suit** — gas mask **and** a whitelisted uniform            | Mustard, Sarin, VX |

## What counts as protection

* **Gas mask** — any mask in the accepted-masks list. Out of the box that's `G_AirPurifyingRespirator_01_F`, `kat_mask_M50`, and `kat_mask_M04`. A mask must actually be worn and still have filter life remaining.
* **Filter life** — masks last **15 minutes** of active protection by default. When the filter is spent, the mask stops protecting you. Carry a **gas mask filter** (`kat_gasmaskFilter`) and use the *Replace gas mask filter* self-action to reset it.
* **CBRN suit** — for Level 2 agents the mask alone is not enough. You also need a uniform that the mission has whitelisted. The default whitelist contains the vanilla CBRN suit (`U_C_CBRN_Suit_01_Blue_F`); mission makers add their own (see [CBA settings](#mission-configuration-cba-settings)).

{% hint style="danger" %}
**Common mistake:** Wearing a mask into a mustard or sarin cloud and assuming you're safe. You're not. Level 2 agents go through the skin — only the full suit stops them.
{% endhint %}

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