From 942f7eebb1e003db67a6483cbc9e19a6d6bf719d Mon Sep 17 00:00:00 2001
From: GSzabados <35445496+GSzabados@users.noreply.github.com>
Date: Sat, 20 Sep 2025 14:40:21 +0200
Subject: [PATCH] Add PM4 device class for Ecowitt (#152568)

---
 homeassistant/components/ecowitt/sensor.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/homeassistant/components/ecowitt/sensor.py b/homeassistant/components/ecowitt/sensor.py
index 631910bde86..6990bf56099 100644
--- a/homeassistant/components/ecowitt/sensor.py
+++ b/homeassistant/components/ecowitt/sensor.py
@@ -253,6 +253,7 @@ ECOWITT_SENSORS_MAPPING: Final = {
     ),
     EcoWittSensorTypes.PM4: SensorEntityDescription(
         key="PM4",
+        device_class=SensorDeviceClass.PM4,
         native_unit_of_measurement=CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,
         state_class=SensorStateClass.MEASUREMENT,
     ),