diff --git a/homeassistant/components/number/const.py b/homeassistant/components/number/const.py
index b0542aa588a..1a2580cfc61 100644
--- a/homeassistant/components/number/const.py
+++ b/homeassistant/components/number/const.py
@@ -210,7 +210,7 @@ class NumberDeviceClass(StrEnum):
     """
 
     PM1 = "pm1"
-    """Particulate matter <= 0.1 μm.
+    """Particulate matter <= 1 μm.
 
     Unit of measurement: `µg/m³`
     """
diff --git a/homeassistant/components/sensor/const.py b/homeassistant/components/sensor/const.py
index 17155912e48..fe01058fda7 100644
--- a/homeassistant/components/sensor/const.py
+++ b/homeassistant/components/sensor/const.py
@@ -248,7 +248,7 @@ class SensorDeviceClass(StrEnum):
     """
 
     PM1 = "pm1"
-    """Particulate matter <= 0.1 μm.
+    """Particulate matter <= 1 μm.
 
     Unit of measurement: `µg/m³`
     """