diff --git a/homeassistant/components/air_quality/__init__.py b/homeassistant/components/air_quality/__init__.py
index 7aed61ee11c..5f770e84b37 100644
--- a/homeassistant/components/air_quality/__init__.py
+++ b/homeassistant/components/air_quality/__init__.py
@@ -15,7 +15,7 @@ _LOGGER = logging.getLogger(__name__)
 
 ATTR_AQI = 'air_quality_index'
 ATTR_ATTRIBUTION = 'attribution'
-ATTR_C02 = 'carbon_dioxide'
+ATTR_CO2 = 'carbon_dioxide'
 ATTR_CO = 'carbon_monoxide'
 ATTR_N2O = 'nitrogen_oxide'
 ATTR_NO = 'nitrogen_monoxide'
@@ -35,7 +35,7 @@ SCAN_INTERVAL = timedelta(seconds=30)
 PROP_TO_ATTR = {
     'air_quality_index': ATTR_AQI,
     'attribution': ATTR_ATTRIBUTION,
-    'carbon_dioxide': ATTR_C02,
+    'carbon_dioxide': ATTR_CO2,
     'carbon_monoxide': ATTR_CO,
     'nitrogen_oxide': ATTR_N2O,
     'nitrogen_monoxide': ATTR_NO,