# Stopping Indoor FX

## FX Block Zone

If a trigger collider is tagged with the [FX Block Zone](../../how-it-works/settings#cozy-trigger-tag) tag, any COZY particles that enter it will immediately be destroyed. This property makes these useful for denoting indoor areas or other areas that you do not want COZY particles to generate in.

These zones will **only** stop particles from generating and will not cull the fog.

## Fog Culling Material (URP)

In URP, there is a special material called "Fog Culling" that can be used on any mesh to cull the COZY fog indoors. To use this, simply assign the material to a mesh that encompasses your indoor area.

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