diff --git a/code/__DEFINES/mobs.dm b/code/__DEFINES/mobs.dm
index 3ce91f4332..2cdb584e8a 100644
--- a/code/__DEFINES/mobs.dm
+++ b/code/__DEFINES/mobs.dm
@@ -347,6 +347,7 @@
 // / Breathing types. Lungs can access either by these or by a string, which will be considered a gas ID.
 #define BREATH_OXY		/datum/breathing_class/oxygen
 #define BREATH_PLASMA	/datum/breathing_class/plasma
+#define BREATH_METHANE	/datum/breathing_class/methane
 
 //Gremlins
 #define NPC_TAMPER_ACT_FORGET 1 //Don't try to tamper with this again
diff --git a/code/datums/atmosphere/planetary.dm b/code/datums/atmosphere/planetary.dm
index 24125681d4..efa57b4e5f 100644
--- a/code/datums/atmosphere/planetary.dm
+++ b/code/datums/atmosphere/planetary.dm
@@ -13,7 +13,7 @@
 	)
 	restricted_gases = list(
 		GAS_BZ=0.1,
-		GAS_METHYL_BROMIDE=0.1,
+		GAS_BROMINE=0.1
 	)
 	restricted_chance = 30
 
@@ -23,26 +23,44 @@
 	minimum_temp = 281
 	maximum_temp = 320
 
+/datum/atmosphere/lavaland/generate_gas_string()
+	if(prob(restricted_chance))
+		base_gases = list(
+			GAS_METHANE=5,
+			GAS_N2=10
+		)
+		normal_gases = list(
+			GAS_METHANE=5,
+			GAS_N2=5,
+		)
+		restricted_gases = list(
+			GAS_AMMONIA = 0.1,
+			GAS_METHYL_BROMIDE = 0.1,
+			GAS_HYDROGEN = 0.1
+		)
+	return ..()
+
 /datum/atmosphere/lavaland/check_for_sanity(datum/gas_mixture/mix)
-	var/datum/breathing_class/o2_class = GLOB.gas_data.breathing_classes[BREATH_OXY]
-	while(o2_class.get_effective_pp(mix) < 10)
-		mix.adjust_moles(GAS_CO2, -0.5)
-		mix.adjust_moles(GAS_O2, 0.5)
+	if(mix.get_moles(GAS_METHANE) < 0.1)
+		var/datum/breathing_class/o2_class = GLOB.gas_data.breathing_classes[BREATH_OXY]
+		while(o2_class.get_effective_pp(mix) < 10)
+			mix.adjust_moles(GAS_CO2, -0.5)
+			mix.adjust_moles(GAS_O2, 0.5)
 
 /datum/atmosphere/icemoon
 	id = ICEMOON_DEFAULT_ATMOS
 
 	base_gases = list(
-		GAS_O2=5,
+		GAS_METHANE=5,
 		GAS_N2=10,
 	)
 	normal_gases = list(
-		GAS_O2=10,
-		GAS_N2=10,
-		GAS_CO2=10,
+		GAS_METHANE=5,
+		GAS_N2=10
 	)
 	restricted_gases = list(
 		GAS_METHYL_BROMIDE=0.1,
+		GAS_HYDROGEN=0.1
 	)
 	restricted_chance = 10
 
@@ -52,3 +70,18 @@
 	minimum_temp = 180
 	maximum_temp = 180
 
+/datum/atmosphere/icemoon/generate_gas_string()
+	if(prob(restricted_chance))
+		base_gases = list(
+			GAS_O2=5,
+			GAS_N2=10,
+		)
+		normal_gases = list(
+			GAS_O2=5,
+			GAS_N2=10,
+		)
+		restricted_gases = list(
+			GAS_BZ = 0.1,
+			GAS_METHYL_BROMIDE = 0.1,
+		)
+	return ..()
diff --git a/code/game/objects/effects/effect_system/effects_foam.dm b/code/game/objects/effects/effect_system/effects_foam.dm
index 6af8a433aa..d9cfc09220 100644
--- a/code/game/objects/effects/effect_system/effects_foam.dm
+++ b/code/game/objects/effects/effect_system/effects_foam.dm
@@ -40,9 +40,16 @@
 	if(hotspot && istype(T) && T.air)
 		qdel(hotspot)
 		var/datum/gas_mixture/G = T.air
-		var/plas_amt = min(30,G.get_moles(GAS_PLASMA))  //Absorb some plasma
-		G.adjust_moles(GAS_PLASMA,-plas_amt)
-		absorbed_plasma += plas_amt
+		var/amt_removed = min(30,G.get_moles(GAS_PLASMA))  //Absorb some plasma
+		G.adjust_moles(GAS_PLASMA,-amt_removed)
+		absorbed_plasma += amt_removed
+		var/list/fire_gases = GLOB.gas_data.fire_temperatures.Copy()
+		for(var/gas in fire_gases - GAS_PLASMA)
+			if(amt_removed <= 0)
+				break
+			var/this_amount = min(30-amt_removed, G.get_moles(gas))
+			G.adjust_moles(gas, -this_amount)
+			amt_removed -= this_amount
 		if(G.return_temperature() > T20C)
 			G.set_temperature(max(G.return_temperature()/2,T20C))
 		T.air_update_turf()
diff --git a/code/modules/atmospherics/auxgm/breathing_classes.dm b/code/modules/atmospherics/auxgm/breathing_classes.dm
index cfc82adbff..51a8e7bd40 100644
--- a/code/modules/atmospherics/auxgm/breathing_classes.dm
+++ b/code/modules/atmospherics/auxgm/breathing_classes.dm
@@ -41,3 +41,18 @@
 	low_alert_datum = /atom/movable/screen/alert/not_enough_tox
 	high_alert_category = "too_much_tox"
 	high_alert_datum = /atom/movable/screen/alert/too_much_tox
+
+/datum/breathing_class/methane
+	gases = list(
+		GAS_METHANE = 1,
+		GAS_METHYL_BROMIDE = -0.7,
+		GAS_OXYGEN = -0.1,
+		GAS_PLUOXIUM = -0.8
+	)
+	products = list(
+		GAS_METHYL_BROMIDE = 1
+	)
+	low_alert_category = "not_enough_ch4"
+	low_alert_datum = /atom/movable/screen/alert/not_enough_ch4
+	high_alert_category = "too_much_ch4"
+	high_alert_datum = /atom/movable/screen/alert/too_much_ch4
diff --git a/code/modules/atmospherics/machinery/airalarm.dm b/code/modules/atmospherics/machinery/airalarm.dm
index de0135519c..d6e48daff0 100644
--- a/code/modules/atmospherics/machinery/airalarm.dm
+++ b/code/modules/atmospherics/machinery/airalarm.dm
@@ -535,7 +535,7 @@
 			for(var/device_id in A.air_scrub_names)
 				send_signal(device_id, list(
 					"power" = 1,
-					"set_filters" = list(GAS_CO2, GAS_MIASMA, GAS_GROUP_CHEMICALS),
+					"set_filters" = list(GAS_CO2, GAS_METHANE, GAS_METHYL_BROMIDE, GAS_MIASMA, GAS_GROUP_CHEMICALS),
 					"scrubbing" = 1,
 					"widenet" = 0,
 				))
diff --git a/code/modules/atmospherics/machinery/components/unary_devices/vent_scrubber.dm b/code/modules/atmospherics/machinery/components/unary_devices/vent_scrubber.dm
index 098618bc65..025435929a 100644
--- a/code/modules/atmospherics/machinery/components/unary_devices/vent_scrubber.dm
+++ b/code/modules/atmospherics/machinery/components/unary_devices/vent_scrubber.dm
@@ -18,7 +18,7 @@
 	var/id_tag = null
 	var/scrubbing = SCRUBBING //0 = siphoning, 1 = scrubbing
 
-	var/filter_types = list(GAS_CO2, GAS_MIASMA, GAS_GROUP_CHEMICALS)
+	var/filter_types = list(GAS_CO2, GAS_METHANE, GAS_METHYL_BROMIDE, GAS_MIASMA, GAS_GROUP_CHEMICALS)
 	var/list/clean_filter_types = null
 	var/volume_rate = 200
 	var/widenet = 0 //is this scrubber acting on the 3x3 area around it.
diff --git a/code/modules/surgery/organs/lungs.dm b/code/modules/surgery/organs/lungs.dm
index f6265969e7..aad33c4e92 100644
--- a/code/modules/surgery/organs/lungs.dm
+++ b/code/modules/surgery/organs/lungs.dm
@@ -440,7 +440,7 @@
 			owner.adjust_bodytemperature(30*TEMPERATURE_DAMAGE_COEFFICIENT)
 		if(50 to INFINITY)
 			owner.adjust_bodytemperature(100*TEMPERATURE_DAMAGE_COEFFICIENT)
-	
+
 /obj/item/organ/lungs/ipc/ui_action_click(mob/user, actiontype)
 	if(!owner)
 		return
@@ -494,7 +494,7 @@
 	if(owner.blood_volume <= next_warn)
 		to_chat(owner, "[owner.blood_volume > BLOOD_VOLUME_BAD ? "<span class='notice'>" : "<span class='warning'>"]Coolant level passed threshold - now [round(owner.blood_volume / BLOOD_VOLUME_NORMAL * 100, 0.1)] percent.</span>")
 		next_warn -= (BLOOD_VOLUME_NORMAL * 0.1)
-			
+
 /obj/item/organ/lungs/plasmaman
 	name = "plasma filter"
 	desc = "A spongy rib-shaped mass for filtering plasma from the air."
@@ -574,6 +574,8 @@
 	// humans usually breathe 21 but require 16/17, so 80% - 1, which is more lenient but it's fine
 	#define SAFE_THRESHOLD_RATIO 0.8
 	var/datum/gas_mixture/breath = SSair.planetary[LAVALAND_DEFAULT_ATMOS] // y'all know
+	if(breath.get_moles(GAS_METHANE) > 0.1)
+		breathing_class = BREATH_METHANE
 	var/pressure = breath.return_pressure()
 	var/total_moles = breath.total_moles()
 	for(var/id in breath.get_gases())