diff --git a/code/datums/atmosphere/planetary.dm b/code/datums/atmosphere/planetary.dm
index f1d2e85755..081777a247 100644
--- a/code/datums/atmosphere/planetary.dm
+++ b/code/datums/atmosphere/planetary.dm
@@ -7,9 +7,9 @@
 		GAS_N2=10,
 	)
 	normal_gases = list(
-		GAS_O2=10,
-		GAS_N2=10,
-		GAS_CO2=10,
+		GAS_O2=5,
+		GAS_N2=5,
+		GAS_CO2=5,
 	)
 	restricted_gases = list(
 		GAS_BZ=0.1,
diff --git a/code/modules/surgery/organs/lungs.dm b/code/modules/surgery/organs/lungs.dm
index 5c914e3d4d..897c7610a1 100644
--- a/code/modules/surgery/organs/lungs.dm
+++ b/code/modules/surgery/organs/lungs.dm
@@ -530,8 +530,8 @@
 	gas_max[GAS_N2] = PP(breath, GAS_N2) + 5
 	var/datum/breathing_class/class = GLOB.gas_data.breathing_classes[breathing_class]
 	var/o2_pp = class.get_effective_pp(breath)
-	safe_breath_min = 0.3 * o2_pp
-	safe_breath_max = 1.3 * o2_pp
+	safe_breath_min = min(3, 0.3 * o2_pp)
+	safe_breath_max = max(18, 1.3 * o2_pp + 1)
 	..()
 	#undef SAFE_THRESHOLD_RATIO