diff --git a/adafruit_ccs811.py b/adafruit_ccs811.py
index 7bc9477..c2489f6 100644
--- a/adafruit_ccs811.py
+++ b/adafruit_ccs811.py
@@ -122,8 +122,8 @@ def __init__(self, i2c_bus, address=0x5A):
         #default to read every second
         self.drive_mode = DRIVE_MODE_1SEC
 
-        self._eCO2 = None # pylint: disable=invalid-name
-        self._TVOC = None # pylint: disable=invalid-name
+        self._eco2 = None # pylint: disable=invalid-name
+        self._tvoc = None # pylint: disable=invalid-name
 
     @property
     def error_code(self):
@@ -143,22 +143,22 @@ def _update_data(self):
                 i2c.write(buf, end=1, stop=False)
                 i2c.readinto(buf, start=1)
 
-            self._eCO2 = (buf[1] << 8) | (buf[2])
-            self._TVOC = (buf[3] << 8) | (buf[4])
+            self._eco2 = (buf[1] << 8) | (buf[2])
+            self._tvoc = (buf[3] << 8) | (buf[4])
 
             if self.error:
                 raise RuntimeError("Error:" + str(self.error_code))
 
     @property
-    def TVOC(self): # pylint: disable=invalid-name
+    def tvoc(self): # pylint: disable=invalid-name
         """Total Volatile Organic Compound in parts per billion."""
         self._update_data()
-        return self._TVOC
+        return self._tvoc
 
     @property
-    def eCO2(self): # pylint: disable=invalid-name
+    def eco2(self): # pylint: disable=invalid-name
         """Equivalent Carbon Dioxide in parts per million. Clipped to 400 to 8192ppm."""
-        return self._eCO2
+        return self._eco2
 
     @property
     def temperature(self):
diff --git a/examples/ccs811_simpletest.py b/examples/ccs811_simpletest.py
index c58968f..df9740e 100644
--- a/examples/ccs811_simpletest.py
+++ b/examples/ccs811_simpletest.py
@@ -16,5 +16,5 @@
 ccs.temp_offset = temp - 25.0
 
 while True:
-    print("CO2: ", ccs.eCO2, " TVOC:", ccs.TVOC, " temp:", ccs.temperature)
+    print("CO2: ", ccs.eco2, " TVOC:", ccs.tvoc, " temp:", ccs.temperature)
     time.sleep(.5)