diff --git a/auxmos.dll b/auxmos.dll
index eb7e3b71fc..4e0687fa2b 100644
Binary files a/auxmos.dll and b/auxmos.dll differ
diff --git a/auxmos.pdb b/auxmos.pdb
index 5d005d3689..da06980179 100644
Binary files a/auxmos.pdb and b/auxmos.pdb differ
diff --git a/code/__DEFINES/reactions.dm b/code/__DEFINES/reactions.dm
index fad53e4830..d1329060eb 100644
--- a/code/__DEFINES/reactions.dm
+++ b/code/__DEFINES/reactions.dm
@@ -42,3 +42,5 @@
 #define FUSION_RAD_MAX						2000
 #define FUSION_RAD_COEFFICIENT				(-1000)
 #define FUSION_INSTABILITY_ENDOTHERMALITY   2
+// Snowflake fire product types
+#define FIRE_PRODUCT_PLASMA 				0
diff --git a/code/__DEFINES/traits.dm b/code/__DEFINES/traits.dm
index 0c4a886b9f..c8791eabb8 100644
--- a/code/__DEFINES/traits.dm
+++ b/code/__DEFINES/traits.dm
@@ -179,6 +179,8 @@
 #define TRAIT_DWARF				"dwarf"
 #define TRAIT_ALCOHOL_TOLERANCE	"alcohol_tolerance"
 #define TRAIT_AGEUSIA			"ageusia"
+#define TRAIT_ANOSMIA			"anosmia"
+#define TRAIT_GOODSMELL			"super_smeller"
 #define TRAIT_HEAVY_SLEEPER		"heavy_sleeper"
 #define TRAIT_NIGHT_VISION		"night_vision"
 #define TRAIT_LIGHT_STEP		"light_step"
diff --git a/code/datums/mutations/actions.dm b/code/datums/mutations/actions.dm
index 8f7d67abb8..dad5237aa5 100644
--- a/code/datums/mutations/actions.dm
+++ b/code/datums/mutations/actions.dm
@@ -205,6 +205,16 @@
 	synchronizer_coeff = 1
 	var/reek = 200
 
+/datum/mutation/human/olfaction/on_acquiring(mob/living/carbon/human/owner)
+	if(..() || HAS_TRAIT(owner, TRAIT_ANOSMIA))
+		return TRUE
+	ADD_TRAIT(owner, TRAIT_GOODSMELL, GENETIC_MUTATION)
+
+/datum/mutation/human/olfaction/on_losing(mob/living/carbon/human/owner)
+	if(..())
+		return
+	REMOVE_TRAIT(owner, TRAIT_GOODSMELL, GENETIC_MUTATION)
+
 /datum/mutation/human/olfaction/modify()
 	if(power)
 		var/obj/effect/proc_holder/spell/targeted/olfaction/S = power
diff --git a/code/datums/traits/negative.dm b/code/datums/traits/negative.dm
index 10f66fce0c..8958226ff4 100644
--- a/code/datums/traits/negative.dm
+++ b/code/datums/traits/negative.dm
@@ -416,3 +416,12 @@ GLOBAL_LIST_EMPTY(family_heirlooms)
 	. = ..()
 	var/mob/living/carbon/human/H = quirk_holder
 	H?.cure_trauma_type(/datum/brain_trauma/severe/monophobia, TRAUMA_RESILIENCE_ABSOLUTE)
+
+/datum/quirk/no_smell
+	name = "Anosmia"
+	desc = "You can't smell anything! You won't be able to detect certain colorless gases."
+	value = -1
+	mob_trait = TRAIT_ANOSMIA
+	gain_text = "<span class='notice'>You can't smell anything!</span>"
+	lose_text = "<span class='notice'>You can smell again!</span>"
+	medical_record_text = "Patient suffers from anosmia and is incapable of smelling gases or particulates."
diff --git a/code/modules/atmospherics/auxgm/gas_types.dm b/code/modules/atmospherics/auxgm/gas_types.dm
index 4e42b3392a..f037e1bfab 100644
--- a/code/modules/atmospherics/auxgm/gas_types.dm
+++ b/code/modules/atmospherics/auxgm/gas_types.dm
@@ -7,6 +7,9 @@
 	heat_penalty = 1
 	transmit_modifier = 1.5
 
+/datum/gas/oxygen/generate_TLV()
+	return new/datum/tlv(16, 19, 40, 50)
+
 /datum/gas/nitrogen
 	id = GAS_N2
 	specific_heat = 20
@@ -48,6 +51,9 @@
 	fusion_power = 3
 	enthalpy = -393500
 
+/datum/gas/carbon_dioxide/generate_TLV()
+	return new/datum/tlv(-1, -1, 5, 10)
+
 /datum/gas/plasma
 	id = GAS_PLASMA
 	specific_heat = 200
@@ -60,19 +66,16 @@
 	powermix = 1
 	fire_burn_rate = OXYGEN_BURN_RATE_BASE // named when plasma fires were the only fires, surely
 	fire_temperature = FIRE_MINIMUM_TEMPERATURE_TO_EXIST
-	fire_products = "plasma_fire"
+	fire_products = FIRE_PRODUCT_PLASMA
 	enthalpy = FIRE_PLASMA_ENERGY_RELEASED // 3000000, 3 megajoules, 3000 kj
 
-/datum/gas/plasma/New()
-	if(world.system_type == UNIX)
-		fire_temperature = null
-
 /datum/gas/water_vapor
 	id = GAS_H2O
 	specific_heat = 40
 	name = "Water Vapor"
 	gas_overlay = "water_vapor"
 	moles_visible = MOLES_GAS_VISIBLE
+	flags = GAS_FLAG_DANGEROUS
 	fusion_power = 8
 	heat_penalty = 8
 	enthalpy = -241800 // FIRE_HYDROGEN_ENERGY_RELEASED is actually what this was supposed to be
@@ -92,10 +95,30 @@
 	enthalpy = 81600
 	heat_resistance = 6
 
+/datum/gas/tritium
+	id = GAS_TRITIUM
+	specific_heat = 10
+	name = "Tritium"
+	gas_overlay = "tritium"
+	moles_visible = MOLES_GAS_VISIBLE
+	flags = GAS_FLAG_DANGEROUS
+	fusion_power = 1
+	powermix = 1
+	heat_penalty = 10
+	transmit_modifier = 30
+	fire_products = list(GAS_H2O = 1)
+	enthalpy = 300000
+	fire_burn_rate = 2
+	fire_radiation_released = 50 // arbitrary number, basically 60 moles of trit burning will just barely start to harm you
+	fire_temperature = FIRE_MINIMUM_TEMPERATURE_TO_EXIST - 50
+
 /datum/gas/nitric_oxide
 	id = GAS_NITRIC
 	specific_heat = 20
 	name = "Nitric oxide"
+	flags = GAS_FLAG_DANGEROUS
+	odor = "sharp sweetness"
+	odor_strength = 1
 	fusion_power = 15
 	enthalpy = 91290
 	heat_resistance = 2
@@ -104,7 +127,7 @@
 	id = GAS_NITRYL
 	specific_heat = 20
 	name = "Nitrogen dioxide"
-	gas_overlay = "nitryl"
+	color = "#963"
 	moles_visible = MOLES_GAS_VISIBLE
 	flags = GAS_FLAG_DANGEROUS
 	fusion_power = 15
@@ -124,6 +147,8 @@
 	specific_heat = 10
 	name = "Hydrogen"
 	flags = GAS_FLAG_DANGEROUS
+	moles_visible = MOLES_GAS_VISIBLE
+	color = "#ffe"
 	fusion_power = 0
 	powermix = 1
 	heat_penalty = 3
@@ -132,27 +157,6 @@
 	fire_burn_rate = 2
 	fire_temperature = FIRE_MINIMUM_TEMPERATURE_TO_EXIST - 50
 
-/datum/gas/tritium
-	id = GAS_TRITIUM
-	specific_heat = 10
-	name = "Tritium"
-	gas_overlay = "tritium"
-	moles_visible = MOLES_GAS_VISIBLE
-	flags = GAS_FLAG_DANGEROUS
-	fusion_power = 1
-	powermix = 1
-	heat_penalty = 10
-	transmit_modifier = 30
-	fire_products = list(GAS_H2O = 1)
-	enthalpy = 300000
-	fire_burn_rate = 2
-	fire_radiation_released = 50 // arbitrary number, basically 60 moles of trit burning will just barely start to harm you
-	fire_temperature = FIRE_MINIMUM_TEMPERATURE_TO_EXIST - 50
-
-/datum/gas/tritium/New()
-	if(world.system_type == UNIX)
-		fire_temperature = null
-
 /datum/gas/bz
 	id = GAS_BZ
 	specific_heat = 20
@@ -168,6 +172,8 @@
 /datum/gas/stimulum
 	id = GAS_STIMULUM
 	specific_heat = 5
+	odor = "the color blue" // fast
+	odor_strength = 10
 	name = "Stimulum"
 	fusion_power = 7
 
@@ -184,10 +190,15 @@
 	transmit_modifier = -5
 	heat_resistance = 3
 
+/datum/gas/pluoxium/generate_TLV()
+	return new/datum/tlv(-1, -1, 5, 6)
+
 /datum/gas/miasma
 	id = GAS_MIASMA
 	specific_heat = 20
 	fusion_power = 50
+	flags = GAS_FLAG_DANGEROUS
+	// snowflaked odor
 	name = "Miasma"
 	gas_overlay = "miasma"
 	moles_visible = MOLES_GAS_VISIBLE * 60
@@ -196,6 +207,9 @@
 	id = GAS_METHANE
 	specific_heat = 30
 	name = "Methane"
+	odor = "natural gas"
+	odor_strength = 2
+	flags = GAS_FLAG_DANGEROUS
 	powerloss_inhibition = 1
 	heat_resistance = 3
 	breath_results = GAS_METHYL_BROMIDE
@@ -234,14 +248,18 @@
 	fire_products = list(GAS_CO2 = 1, GAS_H2O = 1.5, GAS_BROMINE = 0.5)
 	enthalpy = -35400
 	fire_burn_rate = 4 / 7 // oh no
-	fire_temperature = 808 // its autoignition, it apparently doesn't spark readily, so i don't put it lower
+	fire_temperature = 808 // its autoignition; it apparently doesn't spark readily, so i don't put it lower
 
 /datum/gas/bromine
 	id = GAS_BROMINE
 	specific_heat = 76
 	name = "Bromine"
-	flags = GAS_FLAG_DANGEROUS
+	flags = GAS_FLAG_DANGEROUS | GAS_FLAG_CHEMICAL
 	group = GAS_GROUP_CHEMICALS
+	color = "#6e1f00"
+	moles_visible = MOLES_GAS_VISIBLE
+	odor = "bromine" // it's a very recognizable smell
+	odor_strength = 0.1
 	enthalpy = 193 // yeah it's small but it's good to include it
 	breath_reagent = /datum/reagent/bromine
 
@@ -249,7 +267,9 @@
 	id = GAS_AMMONIA
 	specific_heat = 35
 	name = "Ammonia"
-	flags = GAS_FLAG_DANGEROUS
+	odor = "ammonia"
+	odor_strength = 0.01
+	flags = GAS_FLAG_DANGEROUS | GAS_FLAG_CHEMICAL
 	group = GAS_GROUP_CHEMICALS
 	enthalpy = -45900
 	breath_reagent = /datum/reagent/ammonia
diff --git a/code/modules/atmospherics/gasmixtures/auxgm.dm b/code/modules/atmospherics/gasmixtures/auxgm.dm
index 2e5dd716ed..d3de583f04 100644
--- a/code/modules/atmospherics/gasmixtures/auxgm.dm
+++ b/code/modules/atmospherics/gasmixtures/auxgm.dm
@@ -25,6 +25,7 @@ GLOBAL_LIST_INIT(nonreactive_gases, typecacheof(list(GAS_O2, GAS_N2, GAS_CO2, GA
 	var/list/ids = list()
 	var/list/typepaths = list()
 	var/list/fusion_powers = list()
+	var/list/TLV = list()
 	var/list/breathing_classes = list()
 	var/list/breath_results = list()
 	var/list/breath_reagents = list()
@@ -39,13 +40,18 @@ GLOBAL_LIST_INIT(nonreactive_gases, typecacheof(list(GAS_O2, GAS_N2, GAS_CO2, GA
 	var/list/supermatter = list()
 	var/list/groups_by_gas = list()
 	var/list/groups = list()
+	var/list/TLVs = list()
+	var/list/odors = list()
+	var/list/odor_strengths = list()
 
 /datum/gas
 	var/id = ""
 	var/specific_heat = 0
 	var/name = ""
-	var/gas_overlay = "" //icon_state in icons/effects/atmospherics.dmi
-	var/color = "#ffff"
+	var/gas_overlay = "generic" //icon_state in icons/effects/atmospherics.dmi
+	var/color = "#ffff" // Tints the overlay by this color. Use instead of gas_overlay, usually (but not necessarily).
+	var/odor = null // Odor string. Null means none; if not null, anyone who breathes the gas will smell it.
+	var/odor_strength = INFINITY // How strong the odor is; minimal partial pressure to smell, so lower = more.
 	var/moles_visible = null
 	var/flags = NONE //currently used by canisters
 	var/group = null // groups for scrubber/filter listing
@@ -68,6 +74,12 @@ GLOBAL_LIST_INIT(nonreactive_gases, typecacheof(list(GAS_O2, GAS_N2, GAS_CO2, GA
 	var/heat_resistance = 0 // makes the crystal more resistant against heat damage.
 	var/powerloss_inhibition = 0 // Reduces how much power the supermatter loses each tick
 
+/datum/gas/proc/generate_TLV()
+	if(flags & GAS_FLAG_DANGEROUS)
+		return new/datum/tlv/dangerous
+	else
+		return new/datum/tlv(-1, -1, 1000, 1000)
+
 /datum/gas/proc/breath(partial_pressure, light_threshold, heavy_threshold, moles, mob/living/carbon/C, obj/item/organ/lungs/lungs)
 	// This is only called on gases with the GAS_FLAG_BREATH_PROC flag. When possible, do NOT use this--
 	// greatly prefer just adding a reagent. This is mostly around for legacy reasons.
@@ -79,11 +91,15 @@ GLOBAL_LIST_INIT(nonreactive_gases, typecacheof(list(GAS_O2, GAS_N2, GAS_CO2, GA
 		datums[g] = gas
 		specific_heats[g] = gas.specific_heat
 		names[g] = gas.name
+		TLVs[g] = gas.generate_TLV()
 		if(gas.moles_visible)
 			visibility[g] = gas.moles_visible
 			overlays[g] = new /list(FACTOR_GAS_VISIBLE_MAX)
 			for(var/i in 1 to FACTOR_GAS_VISIBLE_MAX)
-				overlays[g][i] = new /obj/effect/overlay/gas(gas.gas_overlay, i * 255 / FACTOR_GAS_VISIBLE_MAX)
+				var/obj/effect/overlay/gas/overlay = new(gas.gas_overlay)
+				overlay.color = gas.color
+				overlay.alpha = i * 255 / FACTOR_GAS_VISIBLE_MAX
+				overlays[g][i] = overlay
 		else
 			visibility[g] = 0
 			overlays[g] = 0
@@ -114,8 +130,11 @@ GLOBAL_LIST_INIT(nonreactive_gases, typecacheof(list(GAS_O2, GAS_N2, GAS_CO2, GA
 		if(gas.group)
 			if(!(gas.group in groups))
 				groups[gas.group] = list()
-			groups[gas.group] += gas
+			groups[gas.group] += g
 			groups_by_gas[g] = gas.group
+		if(gas.odor)
+			odor_strengths[g] = gas.odor_strength
+			odors[g] = gas.odor
 		add_supermatter_properties(gas)
 		_auxtools_register_gas(gas)
 		if(done_initializing)
@@ -145,6 +164,17 @@ GLOBAL_LIST_INIT(nonreactive_gases, typecacheof(list(GAS_O2, GAS_N2, GAS_CO2, GA
 	done_initializing = TRUE
 	finalize_gas_refs()
 
+/datum/auxgm/proc/get_by_flag(flag)
+	var/static/list/gases_by_flag
+	if(!gases_by_flag)
+		gases_by_flag = list()
+	if(!(flag in gases_by_flag))
+		gases_by_flag += flag
+		gases_by_flag[flag] = list()
+		for(var/g in flags)
+			if(flags[g] & flag)
+				gases_by_flag[flag] += g
+	return gases_by_flag[flag]
 
 GLOBAL_DATUM_INIT(gas_data, /datum/auxgm, new)
 
@@ -156,7 +186,6 @@ GLOBAL_DATUM_INIT(gas_data, /datum/auxgm, new)
 	appearance_flags = TILE_BOUND
 	vis_flags = NONE
 
-/obj/effect/overlay/gas/New(state, alph)
+/obj/effect/overlay/gas/New(state)
 	. = ..()
 	icon_state = state
-	alpha = alph
diff --git a/code/modules/atmospherics/gasmixtures/gas_mixture.dm b/code/modules/atmospherics/gasmixtures/gas_mixture.dm
index b670baaae7..56820d2836 100644
--- a/code/modules/atmospherics/gasmixtures/gas_mixture.dm
+++ b/code/modules/atmospherics/gasmixtures/gas_mixture.dm
@@ -135,6 +135,7 @@ we use a hook instead
 /datum/gas_mixture/proc/set_temperature(new_temp)
 /datum/gas_mixture/proc/set_volume(new_volume)
 /datum/gas_mixture/proc/get_moles(gas_type)
+/datum/gas_mixture/proc/get_by_flag(flag)
 /datum/gas_mixture/proc/set_moles(gas_type, moles)
 
 // VV WRAPPERS - EXTOOLS HOOKED PROCS DO NOT TAKE ARGUMENTS FROM CALL() FOR SOME REASON.
@@ -152,13 +153,20 @@ we use a hook instead
 /datum/gas_mixture/proc/scrub_into(datum/gas_mixture/target, ratio, list/gases)
 /datum/gas_mixture/proc/mark_immutable()
 /datum/gas_mixture/proc/get_gases()
+/datum/gas_mixture/proc/add(amt)
+/datum/gas_mixture/proc/subtract(amt)
 /datum/gas_mixture/proc/multiply(factor)
+/datum/gas_mixture/proc/divide(factor)
 /datum/gas_mixture/proc/get_last_share()
 /datum/gas_mixture/proc/clear()
 
 /datum/gas_mixture/proc/adjust_moles(gas_type, amt = 0)
 	set_moles(gas_type, clamp(get_moles(gas_type) + amt,0,INFINITY))
 
+/datum/gas_mixture/proc/adjust_moles_temp(gas_type, amt, temperature)
+
+/datum/gas_mixture/proc/adjust_multi()
+
 /datum/gas_mixture/proc/return_volume() //liters
 
 /datum/gas_mixture/proc/thermal_energy() //joules
@@ -175,6 +183,10 @@ we use a hook instead
 	//Removes amount of gas from the gas_mixture
 	//Returns: gas_mixture with the gases removed
 
+/datum/gas_mixture/proc/remove_by_flag(flag, amount)
+	//Removes amount of gas from the gas mixture by flag
+	//Returns: gas_mixture with gases that match the flag removed
+
 /datum/gas_mixture/proc/transfer_to(datum/gas_mixture/target, amount)
 	//Transfers amount of gas to target. Equivalent to target.merge(remove(amount)) but faster.
 
@@ -235,6 +247,14 @@ we use a hook instead
 	//Makes every gas in the given list have the same pressure, temperature and gas proportions.
 	//Returns: null
 
+/datum/gas_mixture/proc/__remove_by_flag()
+
+/datum/gas_mixture/remove_by_flag(flag, amount)
+	var/datum/gas_mixture/removed = new type
+	__remove_by_flag(removed, flag, amount)
+
+	return removed
+
 /datum/gas_mixture/proc/__remove()
 /datum/gas_mixture/remove(amount)
 	var/datum/gas_mixture/removed = new type
diff --git a/code/modules/atmospherics/gasmixtures/reactions.dm b/code/modules/atmospherics/gasmixtures/reactions.dm
index 85593cf0e0..122d30f33e 100644
--- a/code/modules/atmospherics/gasmixtures/reactions.dm
+++ b/code/modules/atmospherics/gasmixtures/reactions.dm
@@ -117,7 +117,6 @@
 	id = "tritfire"
 
 /datum/gas_reaction/tritfire/init_reqs()
-	exclude = world.system_type == MS_WINDOWS // temporary stopgap until generic fires work on linux
 	min_requirements = list(
 		"TEMP" = FIRE_MINIMUM_TEMPERATURE_TO_EXIST,
 		GAS_TRITIUM = MINIMUM_MOLE_COUNT,
@@ -199,7 +198,6 @@
 	id = "plasmafire"
 
 /datum/gas_reaction/plasmafire/init_reqs()
-	exclude = world.system_type == MS_WINDOWS // temporary stopgap until generic fires work on linux
 	min_requirements = list(
 		"TEMP" = FIRE_MINIMUM_TEMPERATURE_TO_EXIST,
 		GAS_PLASMA = MINIMUM_MOLE_COUNT,
diff --git a/code/modules/atmospherics/machinery/airalarm.dm b/code/modules/atmospherics/machinery/airalarm.dm
index d6e48daff0..66b8277273 100644
--- a/code/modules/atmospherics/machinery/airalarm.dm
+++ b/code/modules/atmospherics/machinery/airalarm.dm
@@ -90,7 +90,6 @@
 	var/frequency = FREQ_ATMOS_CONTROL
 	var/alarm_frequency = FREQ_ATMOS_ALARMS
 	var/datum/radio_frequency/radio_connection
-
 	var/list/TLV = list( // Breathable air.
 		"pressure"					= new/datum/tlv(ONE_ATMOSPHERE * 0.8, ONE_ATMOSPHERE*  0.9, ONE_ATMOSPHERE * 1.1, ONE_ATMOSPHERE * 1.2), // kPa
 		"temperature"				= new/datum/tlv(T0C, T0C+10, T0C+40, T0C+66),
@@ -108,9 +107,17 @@
 		GAS_NITRYL			= new/datum/tlv/dangerous,
 		GAS_PLUOXIUM			= new/datum/tlv(-1, -1, 5, 6), // Unlike oxygen, pluoxium does not fuel plasma/tritium fires
 		GAS_METHANE			= new/datum/tlv(-1, -1, 3, 6),
-		GAS_METHYL_BROMIDE	= new/datum/tlv/dangerous
+		GAS_METHYL_BROMIDE	= new/datum/tlv/dangerous,
+		GAS_AMMONIA		= new/datum/tlv/dangerous,
+		GAS_BROMINE			= new/datum/tlv/dangerous,
+
 	)
 
+/obj/machinery/airalarm/proc/regenerate_TLV()
+	var/list/TLVs = GLOB.gas_data.TLVs
+	for(var/g in TLVs)
+		TLV[g] = TLVs[g]
+
 /obj/machinery/airalarm/server // No checks here.
 	TLV = list(
 		"pressure"					= new/datum/tlv/no_checks,
@@ -132,6 +139,11 @@
 		GAS_METHYL_BROMIDE	= new/datum/tlv/no_checks
 	)
 
+/obj/machinery/airalarm/server/regenerate_TLV()
+	var/list/TLVs = GLOB.gas_data.TLVs
+	for(var/g in TLVs)
+		TLV[g] = new/datum/tlv/no_checks
+
 /obj/machinery/airalarm/kitchen_cold_room // Copypasta: to check temperatures.
 	TLV = list(
 		"pressure"					= new/datum/tlv(ONE_ATMOSPHERE * 0.8, ONE_ATMOSPHERE*  0.9, ONE_ATMOSPHERE * 1.1, ONE_ATMOSPHERE * 1.2), // kPa
@@ -203,6 +215,8 @@
 
 /obj/machinery/airalarm/Initialize(mapload, ndir, nbuild)
 	. = ..()
+	regenerate_TLV()
+	RegisterSignal(SSdcs,COMSIG_GLOB_NEW_GAS,.proc/regenerate_TLV)
 	wires = new /datum/wires/airalarm(src)
 
 	if(ndir)
@@ -535,7 +549,7 @@
 			for(var/device_id in A.air_scrub_names)
 				send_signal(device_id, list(
 					"power" = 1,
-					"set_filters" = list(GAS_CO2, GAS_METHANE, GAS_METHYL_BROMIDE, GAS_MIASMA, GAS_GROUP_CHEMICALS),
+					"set_filters" = list(GAS_CO2, GAS_MIASMA, GAS_GROUP_CHEMICALS),
 					"scrubbing" = 1,
 					"widenet" = 0,
 				))
@@ -546,26 +560,11 @@
 					"set_external_pressure" = ONE_ATMOSPHERE
 				))
 		if(AALARM_MODE_CONTAMINATED)
+			var/list/all_gases = GLOB.gas_data.get_by_flag(GAS_FLAG_DANGEROUS)
 			for(var/device_id in A.air_scrub_names)
 				send_signal(device_id, list(
 					"power" = 1,
-					"set_filters" = list(
-						GAS_CO2,
-						GAS_MIASMA,
-						GAS_PLASMA,
-						GAS_H2O,
-						GAS_HYDROGEN,
-						GAS_HYPERNOB,
-						GAS_NITROUS,
-						GAS_NITRYL,
-						GAS_TRITIUM,
-						GAS_BZ,
-						GAS_STIMULUM,
-						GAS_PLUOXIUM,
-						GAS_METHANE,
-						GAS_METHYL_BROMIDE,
-						GAS_GROUP_CHEMICALS
-					),
+					"set_filters" = all_gases,
 					"scrubbing" = 1,
 					"widenet" = 1,
 				))
@@ -599,7 +598,7 @@
 			for(var/device_id in A.air_scrub_names)
 				send_signal(device_id, list(
 					"power" = 1,
-					"set_filters" = list(GAS_CO2, GAS_MIASMA),
+					"set_filters" = list(GAS_CO2, 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 025435929a..4ced6c0554 100644
--- a/code/modules/atmospherics/machinery/components/unary_devices/vent_scrubber.dm
+++ b/code/modules/atmospherics/machinery/components/unary_devices/vent_scrubber.dm
@@ -42,7 +42,7 @@
 	clean_filter_types = list()
 	for(var/id in filter_types)
 		if(id in GLOB.gas_data.groups)
-			clean_filter_types += GLOB.gas_data.groups[id]
+			clean_filter_types |= GLOB.gas_data.groups[id]
 		else
 			clean_filter_types += id
 
diff --git a/code/modules/mob/living/smell.dm b/code/modules/mob/living/smell.dm
new file mode 100644
index 0000000000..bc82fe5ccb
--- /dev/null
+++ b/code/modules/mob/living/smell.dm
@@ -0,0 +1,62 @@
+#define DEFAULT_SMELL_SENSITIVITY 1
+
+/mob/living
+	var/last_smell_time
+	var/last_smell_text
+
+/mob/living/proc/get_smell_sensitivity()
+	return DEFAULT_SMELL_SENSITIVITY
+
+/mob/living/carbon/get_smell_sensitivity()
+	. = DEFAULT_SMELL_SENSITIVITY
+	var/obj/item/organ/lungs/lungs = getorganslot(ORGAN_SLOT_LUNGS) // don't think about it too hard
+	if(istype(lungs))
+		. = lungs.smell_sensitivity
+	if(HAS_TRAIT(src, TRAIT_ANOSMIA))
+		. *= 0
+	else if(HAS_TRAIT(src, TRAIT_GOODSMELL))
+		. *= 2
+
+/mob/living/proc/smell(datum/gas_mixture/from)
+	if(last_smell_time + 50 > world.time)
+		return FALSE
+	var/smell_sensitivity = get_smell_sensitivity()
+
+	if(smell_sensitivity == 0)
+		return FALSE
+
+	var/pressure = from.return_pressure()
+	var/total_moles = from.total_moles()
+
+	#define PP_MOLES(X) ((X / total_moles) * pressure)
+
+	#define PP(air, gas) PP_MOLES(air.get_moles(gas))
+
+	var/list/odors = GLOB.gas_data.odors
+	var/list/odor_strengths = GLOB.gas_data.odor_strengths
+	var/list/odors_found = list()
+	for(var/gas in from.get_gases())
+		if(!(gas in odors))
+			continue
+		var/pp = PP(from, gas)
+		var/strength = (odor_strengths[gas] / smell_sensitivity)
+		if(pp > 2*strength)
+			odors_found += "[odors[gas]]"
+		else if(pp > strength)
+			odors_found += "a hint of [odors[gas]]"
+	if(!length(odors_found))
+		return FALSE
+	var/text_output = ""
+	if(hallucination > 50 && prob(25))
+		text_output = pick("", "spiders","dreams","nightmares","the future","the past","victory",\
+		"defeat","pain","bliss","chaos","revenge","cold","rotten glass","poison","time","space","death","life","truth","lies","justice","memory",\
+		"regrets","your soul","suffering","magic","music","noise","blood","hunger","the american way")
+	else
+		text_output = english_list(odors_found, "something indescribable")
+	if(text_output != last_smell_text || last_smell_time + 100 < world.time)
+		to_chat(src, "<span class='notice'>You can smell [text_output].</span>")
+		last_smell_time = world.time
+		last_smell_text = text_output
+
+	#undef PP_MOLES
+	#undef PP
diff --git a/code/modules/reagents/chemistry/reagents.dm b/code/modules/reagents/chemistry/reagents.dm
index 8d009ffb2e..0bb847a573 100644
--- a/code/modules/reagents/chemistry/reagents.dm
+++ b/code/modules/reagents/chemistry/reagents.dm
@@ -273,6 +273,7 @@ GLOBAL_LIST_INIT(name2reagent, build_name2reagent())
 	G.color = color
 	G.breath_reagent = src.type
 	G.group = GAS_GROUP_CHEMICALS
+	G.moles_visible = MOLES_GAS_VISIBLE
 	return G
 
 /datum/reagent/proc/create_gas()
diff --git a/code/modules/reagents/chemistry/reagents/other_reagents.dm b/code/modules/reagents/chemistry/reagents/other_reagents.dm
index d4d3cf7e7e..abe3aef82d 100644
--- a/code/modules/reagents/chemistry/reagents/other_reagents.dm
+++ b/code/modules/reagents/chemistry/reagents/other_reagents.dm
@@ -1497,6 +1497,13 @@
 			myseed.adjust_yield(1)
 			myseed.adjust_instability(1)
 
+/datum/reagent/ammonia/reaction_mob(mob/living/M, method=TOUCH, reac_volume, touch_protection)
+	if(method == VAPOR)
+		M.adjustOrganLoss(ORGAN_SLOT_LUNGS, ((100-touch_protection)/100)*reac_volume*REAGENTS_EFFECT_MULTIPLIER * 0.25)
+		if(prob(reac_volume))
+			to_chat(M, "<span class='danger'>Your lungs hurt!</span>")
+	return ..()
+
 /datum/reagent/diethylamine
 	name = "Diethylamine"
 	description = "A secondary amine, mildly corrosive."
@@ -1807,6 +1814,10 @@
 	boiling_point = 332
 	pH = 7.8
 
+/datum/reagent/bromine/on_mob_life(mob/living/carbon/C)
+	C.adjustOrganLoss(ORGAN_SLOT_BRAIN, 0.2, 99)
+	..()
+
 /datum/reagent/phenol
 	name = "Phenol"
 	description = "An aromatic ring of carbon with a hydroxyl group. A useful precursor to some medicines, but has no healing properties on its own."
diff --git a/code/modules/surgery/organs/lungs.dm b/code/modules/surgery/organs/lungs.dm
index aad33c4e92..cb2c02fa7c 100644
--- a/code/modules/surgery/organs/lungs.dm
+++ b/code/modules/surgery/organs/lungs.dm
@@ -76,6 +76,8 @@
 	var/heat_level_3_damage = HEAT_GAS_DAMAGE_LEVEL_3
 	var/heat_damage_type = BURN
 
+	var/smell_sensitivity = 1
+
 	var/crit_stabilizing_reagent = /datum/reagent/medicine/epinephrine
 
 /obj/item/organ/lungs/New()
@@ -245,12 +247,16 @@
 		else if(alert_category)
 			H.clear_alert(alert_category)
 	var/list/breath_reagents = GLOB.gas_data.breath_reagents
+	var/static/datum/reagents/reagents_holder = new
+	reagents_holder.clear_reagents()
+	reagents_holder.chem_temp = breath.return_temperature()
 	for(var/gas in breath.get_gases())
 		if(gas in breath_reagents)
 			var/datum/reagent/R = breath_reagents[gas]
-			H.reagents.add_reagent(R, breath.get_moles(gas) * initial(R.molarity))
+			reagents_holder.add_reagent(R, breath.get_moles(gas) * initial(R.molarity))
 			mole_adjustments[gas] = (gas in mole_adjustments) ? mole_adjustments[gas] - breath.get_moles(gas) : -breath.get_moles(gas)
-
+	reagents_holder.reaction(H, VAPOR, from_gas = 1)
+	H.smell(breath)
 	for(var/gas in mole_adjustments)
 		breath.adjust_moles(gas, mole_adjustments[gas])
 
@@ -523,6 +529,7 @@
 	safe_breath_min = 13
 	safe_breath_max = 100
 	emp_vulnerability = 2
+	smell_sensitivity = 1.5
 
 /obj/item/organ/lungs/cybernetic/tier3
 	name = "upgraded cybernetic lungs"
@@ -540,6 +547,7 @@
 	SA_sleep_min = 50
 	BZ_brain_damage_min = 30
 	emp_vulnerability = 3
+	smell_sensitivity = 2
 
 	cold_level_1_threshold = 200
 	cold_level_2_threshold = 140
diff --git a/code/modules/vore/eating/living.dm b/code/modules/vore/eating/living.dm
index 1f4950eaa7..99c1236d9c 100644
--- a/code/modules/vore/eating/living.dm
+++ b/code/modules/vore/eating/living.dm
@@ -18,7 +18,7 @@
 // Hook for generic creation of stuff on new creatures
 //
 /hook/living_new/proc/vore_setup(mob/living/M)
-	add_verb(M, list(/mob/living/proc/preyloop_refresh, /mob/living/proc/lick, /mob/living/proc/smell, /mob/living/proc/escapeOOC))
+	add_verb(M, list(/mob/living/proc/preyloop_refresh, /mob/living/proc/lick, /mob/living/proc/smell_someone, /mob/living/proc/escapeOOC))
 
 	if(M.vore_flags & NO_VORE) //If the mob isn't supposed to have a stomach, let's not give it an insidepanel so it can make one for itself, or a stomach.
 		return TRUE
@@ -394,7 +394,7 @@
 //
 // Equally important as the above
 //
-/mob/living/proc/smell()
+/mob/living/proc/smell_someone()
 	set name = "Smell Someone"
 	set category = "Vore"
 	set desc = "Smell someone nearby!"
diff --git a/dependencies.sh b/dependencies.sh
index 0a27dd623f..7943782996 100644
--- a/dependencies.sh
+++ b/dependencies.sh
@@ -21,7 +21,7 @@ export SPACEMAN_DMM_VERSION=suite-1.7
 export PYTHON_VERSION=3.7.9
 
 # Auxmos git tag
-export AUXMOS_VERSION=v0.3.0
+export AUXMOS_VERSION=v1.1.1
 
 # Extools git tag
 export EXTOOLS_VERSION=v0.0.7
diff --git a/icons/effects/atmospherics.dmi b/icons/effects/atmospherics.dmi
index acf48a0bd0..6c2412c04b 100644
Binary files a/icons/effects/atmospherics.dmi and b/icons/effects/atmospherics.dmi differ
diff --git a/tgstation.dme b/tgstation.dme
index b148d8324f..e33a3644d6 100644
--- a/tgstation.dme
+++ b/tgstation.dme
@@ -2588,6 +2588,7 @@
 #include "code\modules\mob\living\login.dm"
 #include "code\modules\mob\living\logout.dm"
 #include "code\modules\mob\living\say.dm"
+#include "code\modules\mob\living\smell.dm"
 #include "code\modules\mob\living\stamina_buffer.dm"
 #include "code\modules\mob\living\status_procs.dm"
 #include "code\modules\mob\living\taste.dm"