diff --git a/homeassistant/components/accuweather/const.py b/homeassistant/components/accuweather/const.py
index f09b9771ab6..7216f5a0b9b 100644
--- a/homeassistant/components/accuweather/const.py
+++ b/homeassistant/components/accuweather/const.py
@@ -59,13 +59,14 @@ AIR_QUALITY_CATEGORY_MAP = {
     1: "good",
     2: "moderate",
     3: "unhealthy",
-    4: "hazardous",
+    4: "very_unhealthy",
+    5: "hazardous",
 }
 POLLEN_CATEGORY_MAP = {
     1: "low",
     2: "moderate",
     3: "high",
-    4: "very high",
+    4: "very_high",
 }
 UPDATE_INTERVAL_OBSERVATION = timedelta(minutes=40)
 UPDATE_INTERVAL_DAILY_FORECAST = timedelta(hours=6)
diff --git a/homeassistant/components/accuweather/strings.json b/homeassistant/components/accuweather/strings.json
index e5190b7a8da..d9777352b93 100644
--- a/homeassistant/components/accuweather/strings.json
+++ b/homeassistant/components/accuweather/strings.json
@@ -27,7 +27,8 @@
           "good": "Good",
           "hazardous": "Hazardous",
           "moderate": "Moderate",
-          "unhealthy": "Unhealthy"
+          "unhealthy": "Unhealthy",
+          "very_unhealthy": "Very unhealthy"
         },
         "state_attributes": {
           "options": {
@@ -35,7 +36,8 @@
               "good": "[%key:component::accuweather::entity::sensor::air_quality::state::good%]",
               "hazardous": "[%key:component::accuweather::entity::sensor::air_quality::state::hazardous%]",
               "moderate": "[%key:component::accuweather::entity::sensor::air_quality::state::moderate%]",
-              "unhealthy": "[%key:component::accuweather::entity::sensor::air_quality::state::unhealthy%]"
+              "unhealthy": "[%key:component::accuweather::entity::sensor::air_quality::state::unhealthy%]",
+              "very_unhealthy": "[%key:component::accuweather::entity::sensor::air_quality::state::very_unhealthy%]"
             }
           }
         }
diff --git a/tests/components/accuweather/snapshots/test_sensor.ambr b/tests/components/accuweather/snapshots/test_sensor.ambr
index 3176f0a88bd..cbd2e14207e 100644
--- a/tests/components/accuweather/snapshots/test_sensor.ambr
+++ b/tests/components/accuweather/snapshots/test_sensor.ambr
@@ -9,6 +9,7 @@
         'good',
         'moderate',
         'unhealthy',
+        'very_unhealthy',
         'hazardous',
       ]),
     }),
@@ -50,6 +51,7 @@
         'good',
         'moderate',
         'unhealthy',
+        'very_unhealthy',
         'hazardous',
       ]),
     }),
@@ -71,6 +73,7 @@
         'good',
         'moderate',
         'unhealthy',
+        'very_unhealthy',
         'hazardous',
       ]),
     }),
@@ -112,6 +115,7 @@
         'good',
         'moderate',
         'unhealthy',
+        'very_unhealthy',
         'hazardous',
       ]),
     }),
@@ -133,6 +137,7 @@
         'good',
         'moderate',
         'unhealthy',
+        'very_unhealthy',
         'hazardous',
       ]),
     }),
@@ -174,6 +179,7 @@
         'good',
         'moderate',
         'unhealthy',
+        'very_unhealthy',
         'hazardous',
       ]),
     }),
@@ -195,6 +201,7 @@
         'good',
         'moderate',
         'unhealthy',
+        'very_unhealthy',
         'hazardous',
       ]),
     }),
@@ -236,6 +243,7 @@
         'good',
         'moderate',
         'unhealthy',
+        'very_unhealthy',
         'hazardous',
       ]),
     }),
@@ -257,6 +265,7 @@
         'good',
         'moderate',
         'unhealthy',
+        'very_unhealthy',
         'hazardous',
       ]),
     }),
@@ -298,6 +307,7 @@
         'good',
         'moderate',
         'unhealthy',
+        'very_unhealthy',
         'hazardous',
       ]),
     }),