Next config in Esseker map does not give spookyarea fog or any particles. Temperatures are getting to freezing with "SpookyArea23" so trigger works. Tested wit SpookyArea and SpookyArea23.

{
"Areas": [
{ "AreaName": "Bunker2",
"Type": "ContaminatedArea_Static",
"TriggerType": "ContaminatedTrigger",
"Data": {
"Pos": [ 4143, 183, 4645 ],
"Radius": 200,
"PosHeight": 15,
"NegHeight": 20,
"InnerPartDist": 80,
"OuterOffset": 30,
"ParticleName": "graphics/particles/contaminated_area_gas_bigass"
},
"PlayerData": {
"AroundPartName": "graphics/particles/contaminated_area_gas_around",
"TinyPartName": "graphics/particles/contaminated_area_gas_around_tiny",
"PPERequesterType": "PPERequester_ContaminatedAreaTint"
}
},
{ "AreaName": "EssekerPrison",
"Type": "SpookyArea23",
"TriggerType": "SpookyTrigger23",
"Data": {
"Pos": [ 12045, 118, 5201 ],
"Radius": 150,
"PosHeight": 25,
"NegHeight": 20,
"InnerPartDist": 80,
"OuterOffset": 30,
"ParticleName": "graphics/particles/spooky_mist"
},
"PlayerData": {
"AroundPartName": "",
"TinyPartName": "",
"PPERequesterType": "PPERequester_SpookyAreaTint"
}
}
],

"SafePositions":[]
}

Use following in cfgEffectArea.json

"Type": "SpookyArea23",
"TriggerType": "SpookyTrigger23",

There should be fog particles?