diff --git a/code/__DEFINES/atmospherics.dm b/code/__DEFINES/atmospherics.dm
index 6f4aa69277..73f2661ed5 100644
--- a/code/__DEFINES/atmospherics.dm
+++ b/code/__DEFINES/atmospherics.dm
@@ -77,7 +77,7 @@
 //HUMANS
 //Hurty numbers
 #define FIRE_DAMAGE_MODIFIER	0.0215	//Higher values result in more external fire damage to the skin
-#define AIR_DAMAGE_MODIFIER		2.025	//More means less damage from hot air scalding lungs, less = more damage
+#define AIR_DAMAGE_MODIFIER		1.025	//More means less damage from hot air scalding lungs, less = more damage //CITADEL EDIT 1.025
 
 // Pressure limits.
 #define HAZARD_HIGH_PRESSURE				550		//This determins at what pressure the ultra-high pressure red icon is displayed. (This one is set as a constant)
@@ -95,7 +95,7 @@
 #define BODYTEMP_COOLING_MAX				-100		//The maximum number of degrees that your body can cool in 1 tick, due to the environment, when in a cold area.
 #define BODYTEMP_HEATING_MAX				30		//The maximum number of degrees that your body can heat up in 1 tick, due to the environment, when in a hot area.
 
-#define BODYTEMP_HEAT_DAMAGE_LIMIT			(BODYTEMP_NORMAL + 50) // The limit the human body can take before it starts taking damage from heat.
+#define BODYTEMP_HEAT_DAMAGE_LIMIT			(BODYTEMP_NORMAL + 20) // The limit the human body can take before it starts taking damage from heat. //CITADEL EDIT to 20
 #define BODYTEMP_COLD_DAMAGE_LIMIT			(BODYTEMP_NORMAL - 50) // The limit the human body can take before it starts taking damage from coldness.
 
 
@@ -123,8 +123,8 @@
 #define SHOES_MAX_TEMP_PROTECT				1500	//For gloves
 
 #define PRESSURE_DAMAGE_COEFFICIENT			4		//The amount of pressure damage someone takes is equal to (pressure / HAZARD_HIGH_PRESSURE)*PRESSURE_DAMAGE_COEFFICIENT, with the maximum of MAX_PRESSURE_DAMAGE
-#define MAX_HIGH_PRESSURE_DAMAGE			4
-#define LOW_PRESSURE_DAMAGE					4		//The amount of damage someone takes when in a low pressure area (The pressure threshold is so low that it doesn't make sense to do any calculations, so it just applies this flat value).
+#define MAX_HIGH_PRESSURE_DAMAGE			16		// CITADEL CHANGES Max to 16, low to 8. 
+#define LOW_PRESSURE_DAMAGE					8		//The amount of damage someone takes when in a low pressure area (The pressure threshold is so low that it doesn't make sense to do any calculations, so it just applies this flat value).
 
 #define COLD_SLOWDOWN_FACTOR				20		//Humans are slowed by the difference between bodytemp and BODYTEMP_COLD_DAMAGE_LIMIT divided by this