diff --git a/meshtastic/telemetry.proto b/meshtastic/telemetry.proto
index 9a2f547..1a27673 100644
--- a/meshtastic/telemetry.proto
+++ b/meshtastic/telemetry.proto
@@ -245,62 +245,62 @@ message PowerMetrics {
  */
 message AirQualityMetrics {
   /*
-   * Concentration Units Standard PM1.0
+   * Concentration Units Standard PM1.0 in ug/m3
    */
   optional uint32 pm10_standard = 1;
 
   /*
-   * Concentration Units Standard PM2.5
+   * Concentration Units Standard PM2.5 in ug/m3
    */
   optional uint32 pm25_standard = 2;
 
   /*
-   * Concentration Units Standard PM10.0
+   * Concentration Units Standard PM10.0 in ug/m3
    */
   optional uint32 pm100_standard = 3;
 
   /*
-   * Concentration Units Environmental PM1.0
+   * Concentration Units Environmental PM1.0 in ug/m3
    */
   optional uint32 pm10_environmental = 4;
 
   /*
-   * Concentration Units Environmental PM2.5
+   * Concentration Units Environmental PM2.5 in ug/m3
    */
   optional uint32 pm25_environmental = 5;
 
   /*
-   * Concentration Units Environmental PM10.0
+   * Concentration Units Environmental PM10.0 in ug/m3
    */
   optional uint32 pm100_environmental = 6;
 
   /*
-   * 0.3um Particle Count
+   * 0.3um Particle Count in #/01.l
    */
   optional uint32 particles_03um = 7;
 
   /*
-   * 0.5um Particle Count
+   * 0.5um Particle Count in #/01.l
    */
   optional uint32 particles_05um = 8;
 
   /*
-   * 1.0um Particle Count
+   * 1.0um Particle Count in #/01.l
    */
   optional uint32 particles_10um = 9;
 
   /*
-   * 2.5um Particle Count
+   * 2.5um Particle Count in #/01.l
    */
   optional uint32 particles_25um = 10;
 
   /*
-   * 5.0um Particle Count
+   * 5.0um Particle Count in #/01.l
    */
   optional uint32 particles_50um = 11;
 
   /*
-   * 10.0um Particle Count
+   * 10.0um Particle Count in #/01.l
    */
   optional uint32 particles_100um = 12;
 
@@ -333,6 +333,41 @@ message AirQualityMetrics {
    * Formaldehyde sensor temperature in degrees Celsius
    */
   optional float form_temperature = 18;
+  
+  /*
+   * Concentration Units Standard PM4.0 in ug/m3
+   */
+  optional uint32 pm40_standard = 19;
+
+  /*
+   * 4.0um Particle Count in #/01.l
+   */
+  optional uint32 particles_40um = 20;
+
+  /*
+   * PM Sensor Temperature
+   */
+  optional float pm_temperature = 21;
+
+  /*
+   * PM Sensor humidity
+   */
+  optional float pm_humidity = 22;
+
+  /*
+   * PM Sensor VOC Index
+   */
+  optional float pm_voc_idx = 23;
+
+  /*
+   * PM Sensor NOx Index
+   */
+  optional float pm_nox_idx = 24;
+
+  /*
+   * Typical Particle Size in um
+   */
+  optional float particles_tps = 25;
 }
 
 /*
@@ -741,6 +776,11 @@ enum TelemetrySensorType {
    * Sensirion SFA30 Formaldehyde sensor
    */
   SFA30 = 42;
+
+  /*
+   * SEN5X PM SENSORS
+   */
+  SEN5X = 43;
 }
 
 /*