diff --git a/src/MQUnifiedsensor.cpp b/src/MQUnifiedsensor.cpp
index ca0868c..8bac1a5 100644
--- a/src/MQUnifiedsensor.cpp
+++ b/src/MQUnifiedsensor.cpp
@@ -8,61 +8,73 @@
   if(_type == 2)
   {
     memcpy(_MQ, _MQ2, sizeof(_MQ2));
+    _ratioInCleanAir = RatioMQ2CleanAir;
     //_MQ = MQ2;
   }
   else if(_type == 3)
   {
     memcpy(_MQ, _MQ3, sizeof(_MQ3));
+    _ratioInCleanAir = RatioMQ3CleanAir;
     //_MQ = MQ3;
   }
   else if(_type == 4)
   {
     memcpy(_MQ, _MQ4, sizeof(_MQ4));
+    _ratioInCleanAir = RatioMQ4CleanAir;
     //_MQ = MQ4;
   }
   else if(_type == 5)
   {
     memcpy(_MQ, _MQ5, sizeof(_MQ5));
+    _ratioInCleanAir = RatioMQ5CleanAir;
     //_MQ = MQ5;
   }
   else if(_type == 6)
   {
     memcpy(_MQ, _MQ6, sizeof(_MQ6));
+    _ratioInCleanAir = RatioMQ6CleanAir;
     //_MQ = MQ6;
   }
   else if(_type == 7)
   {
     memcpy(_MQ, _MQ7, sizeof(_MQ7));
+    _ratioInCleanAir = RatioMQ7CleanAir;
     //_MQ = MQ7;
   }
   else if(_type == 8)
   {
     memcpy(_MQ, _MQ8, sizeof(_MQ8));
+    _ratioInCleanAir = RatioMQ8CleanAir;
     //_MQ = MQ8;
   }
   else if(_type == 9)
   {
     memcpy(_MQ, _MQ9, sizeof(_MQ9));
+    _ratioInCleanAir = RatioMQ9CleanAir;
     //_MQ = MQ9;
   }
   else if(_type == 131)
   {
     memcpy(_MQ, _MQ131, sizeof(_MQ131));
+    _ratioInCleanAir = RatioMQ131CleanAir;
     //_MQ = MQ131;
   }
   else if(_type == 135)
   {
     memcpy(_MQ, _MQ135, sizeof(_MQ135));
+    _ratioInCleanAir = RatioMQ135CleanAir;
     //_MQ = MQ135;
   }
   else if(_type == 303)
   {
     memcpy(_MQ, _MQ303A, sizeof(_MQ303A));
+    _ratioInCleanAir = RatioMQ303CleanAir;
     //_MQ = MQ303A;
   }
   else if(_type == 309)
   {
     memcpy(_MQ, _MQ309A, sizeof(_MQ309A));
+    _ratioInCleanAir = RatioMQ309CleanAir;
     //_MQ = MQ309;
   }
 }
@@ -222,57 +234,6 @@ void MQUnifiedsensor::setDefaultGas()
       _nameLectureRequeired = defaultMQ309;
     }
 }
-void MQUnifiedsensor::setRatioInCleanAir()
-{
-    if(_type == 2)
-    {
-      _ratioInCleanAir = RatioMQ2CleanAir;
-    }
-    else if(_type == 3)
-    {
-      _ratioInCleanAir = RatioMQ3CleanAir;
-    }
-    else if(_type == 4)
-    {
-      _ratioInCleanAir = RatioMQ4CleanAir;
-    }
-    else if(_type == 5)
-    {
-      _ratioInCleanAir = RatioMQ5CleanAir;
-    }
-    else if(_type == 6)
-    {
-      _ratioInCleanAir = RatioMQ6CleanAir;
-    }
-    else if(_type == 7)
-    {
-      _ratioInCleanAir = RatioMQ7CleanAir;
-    }
-    else if(_type == 8)
-    {
-      _ratioInCleanAir = RatioMQ8CleanAir;
-    }
-    else if(_type == 9)
-    {
-      _ratioInCleanAir = RatioMQ9CleanAir;
-    }
-    else if(_type == 131)
-    {
-      _ratioInCleanAir = RatioMQ131CleanAir;
-    }
-    else if(_type == 135)
-    {
-      _ratioInCleanAir = RatioMQ135CleanAir;
-    }
-    else if(_type == 303)
-    {
-      _ratioInCleanAir = RatioMQ303CleanAir;
-    }
-    else if(_type == 309)
-    {
-      _ratioInCleanAir = RatioMQ309CleanAir;
-    }
-}
 double MQUnifiedsensor::stringToDouble(String & str)
 {
   return atof( str.c_str() );
diff --git a/src/MQUnifiedsensor.h b/src/MQUnifiedsensor.h
index 17380c3..bf3cff8 100644
--- a/src/MQUnifiedsensor.h
+++ b/src/MQUnifiedsensor.h
@@ -75,7 +75,6 @@ class MQUnifiedsensor
     void setVoltResolution(float voltaje);
     void setSensorCharacteristics(String nameLectureReqeuired, bool print);
     void setDefaultGas();
-    void setRatioInCleanAir();
     
     int readSensor(String nameLectureRequeired = "", bool print = false);
     int readPPM(int m, int b);