Merge pull request #3708 from Citadel-Station-13/upstream-merge-32213

[MIRROR] New ambience for ash storms

code/game/area/areas.dm

@@ -132,6 +132,22 @@ GLOBAL_LIST_EMPTY(teleportlocs)
 	if(!IS_DYNAMIC_LIGHTING(src))
 		add_overlay(/obj/effect/fullbright)
 
+	if(contents.len)
+		var/list/areas_in_z = SSmapping.areas_in_z
+		var/z
+		for(var/i in 1 to contents.len)
+			var/atom/thing = contents[i]
+			if(!thing)
+				continue
+			z = thing.z
+			break
+		if(!z)
+			WARNING("No z found for [src]")
+			return
+		if(!areas_in_z["[z]"])
+			areas_in_z["[z]"] = list()
+		areas_in_z["[z]"] += src
+
 /area/Destroy()
 	STOP_PROCESSING(SSobj, src)
 	return ..()