Restrict dust, meteors and space carp events to space z-levels only.

code/modules/events/carp_migration.dm

@@ -10,6 +10,10 @@
 	endWhen += severity * 25
 	carp_cap = 2 + 3 ** severity // No more than this many at once regardless of waves. (5, 11, 29)
 
+/datum/event/carp_migration/start()
+	affecting_z -= global.using_map.sealed_levels // Space levels only please!
+	..()
+
 /datum/event/carp_migration/announce()
 	var/announcement = ""
 	if(severity == EVENT_LEVEL_MAJOR)

code/modules/events/dust.dm

@@ -2,6 +2,10 @@
 	startWhen	= 10
 	endWhen		= 30
 
+/datum/event/carp_migration/start()
+	affecting_z -= global.using_map.sealed_levels // Space levels only please!
+	..()
+
 /datum/event/dust/announce()
 	if(victim)
 		command_announcement.Announce("The [location_name()] is now passing through a belt of space dust.", "[location_name()] Sensor Array")

code/modules/events/event.dm

@@ -162,7 +162,7 @@
 	startedAt = world.time
 
 	if(!affecting_z)
-		affecting_z = using_map.station_levels
+		affecting_z = using_map.station_levels.Copy()
 
 	setup()
 	..()

code/modules/events/meteors.dm

@@ -19,6 +19,10 @@
 	start_side = pick(cardinal)
 	endWhen = worst_case_end()
 
+/datum/event/meteor_wave/start()
+	affecting_z -= global.using_map.sealed_levels // Space levels only please!
+	..()
+
 /datum/event/meteor_wave/announce()
 	switch(severity)
 		if(EVENT_LEVEL_MAJOR)